Bump error_prone_core from 2.19.1 to 2.20.0

Bumps [error_prone_core](https://github.com/google/error-prone) from 2.19.1 to 2.20.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/google/error-prone/releases">error_prone_core's releases</a>.</em></p>
<blockquote>
<h2>Error Prone 2.20.0</h2>
<p>Changes:</p>
<ul>
<li>This release is compatible with early-access builds of JDK 21.</li>
</ul>
<p>New Checkers:</p>
<ul>
<li><a href="https://errorprone.info/bugpattern/InlineTrivialConstant"><code>InlineTrivialConstant</code></a></li>
<li><a href="https://errorprone.info/bugpattern/UnnecessaryStringBuilder"><code>UnnecessaryStringBuilder</code></a></li>
<li><a href="https://errorprone.info/bugpattern/BanClassLoader"><code>BanClassLoader</code></a></li>
<li><a href="https://errorprone.info/bugpattern/DereferenceWithNullBranch"><code>DereferenceWithNullBranch</code></a></li>
<li><a href="https://errorprone.info/bugpattern/DoNotUseRuleChain"><code>DoNotUseRuleChain</code></a></li>
<li><a href="https://errorprone.info/bugpattern/LockOnNonEnclosingClassLiteral"><code>LockOnNonEnclosingClassLiteral</code></a></li>
<li><a href="https://errorprone.info/bugpattern/MissingRefasterAnnotation"><code>MissingRefasterAnnotation</code></a></li>
<li><a href="https://errorprone.info/bugpattern/NamedLikeContextualKeyword"><code>NamedLikeContextualKeyword</code></a></li>
<li><a href="https://errorprone.info/bugpattern/NonApiType"><code>NonApiType</code></a></li>
</ul>
<p>Fixes issues: <a href="https://redirect.github.com/google/error-prone/issues/2232">#2232</a>, <a href="https://redirect.github.com/google/error-prone/issues/2243">#2243</a>, <a href="https://redirect.github.com/google/error-prone/issues/2997">#2997</a>, <a href="https://redirect.github.com/google/error-prone/issues/3301">#3301</a>, <a href="https://redirect.github.com/google/error-prone/issues/3843">#3843</a>, <a href="https://redirect.github.com/google/error-prone/issues/3903">#3903</a>, <a href="https://redirect.github.com/google/error-prone/issues/3918">#3918</a>, <a href="https://redirect.github.com/google/error-prone/issues/3923">#3923</a>, <a href="https://redirect.github.com/google/error-prone/issues/3931">#3931</a>, <a href="https://redirect.github.com/google/error-prone/issues/3945">#3945</a>, <a href="https://redirect.github.com/google/error-prone/issues/3946">#3946</a></p>
<p><strong>Full Changelog</strong>: <a href="https://github.com/google/error-prone/compare/v2.19.1...v2.20.0">https://github.com/google/error-prone/compare/v2.19.1...v2.20.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/google/error-prone/commit/79935c08884ef855cbb7ca3c3c4b14f878d3536a"><code>79935c0</code></a> Release Error Prone 2.20.0</li>
<li><a href="https://github.com/google/error-prone/commit/4148b441ad2ebd9c23e828a4114b250ceda905ed"><code>4148b44</code></a> Remove FRAGILE_CODE tag from StringCaseLocaleUsage</li>
<li><a href="https://github.com/google/error-prone/commit/b42c84f405827d0496c4da829587cc93d924632f"><code>b42c84f</code></a> Strip enough &quot;*&quot;s to turn something into non-Javadoc.</li>
<li><a href="https://github.com/google/error-prone/commit/12b90df1e5c1efa776b5f8eaa967a6e3381a36cc"><code>12b90df</code></a> Fix one of the classic blunders in <code>UnnecessaryStringBuilder</code></li>
<li><a href="https://github.com/google/error-prone/commit/a86e28bd53d3b95f799a286ec6cacfaf6542de91"><code>a86e28b</code></a> Warn when on <code>Stream</code> parameters and <code>Iterator</code> return types.</li>
<li><a href="https://github.com/google/error-prone/commit/4f11cba7117dff323a5e812f5175a142fe3ad100"><code>4f11cba</code></a> Don't fire some <code>NonApiType</code> checks inside of <code>GraphWrapper</code>s.</li>
<li><a href="https://github.com/google/error-prone/commit/e3743fc03900663515dc400cd76603bcfc13fef4"><code>e3743fc</code></a> Add a check for unnecessary usages of <code>StringBuilder</code></li>
<li><a href="https://github.com/google/error-prone/commit/3195ab03b000401b947f57f300e38073c68e9e1f"><code>3195ab0</code></a> Recognize <code>MethodHandle</code> as immutable.</li>
<li><a href="https://github.com/google/error-prone/commit/7f368567c684fd9a18403541118ddaac45c4be6d"><code>7f36856</code></a> Fire <code>InlineTrivialConstant</code> on <code>EMPTY</code> and <code>EMPTY_STR</code> too.</li>
<li><a href="https://github.com/google/error-prone/commit/bda0edc01a69bc98e2d6fea0be5197d14cb421f9"><code>bda0edc</code></a> Suggest inlining trivial constants like <code>EMPTY_STRING</code></li>
<li>Additional commits viewable in <a href="https://github.com/google/error-prone/compare/v2.19.1...v2.20.0">compare view</a></li>
</ul>
</details>
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Fixes #253

COPYBARA_INTEGRATE_REVIEW=#253 from google:dependabot/maven/com.google.errorprone-error_prone_core-2.20.0 66dd2a0
PiperOrigin-RevId: 542301458

pom.xml

@@ -104,7 +104,7 @@
       it in the properties section of
       https://github.com/google/error-prone/blob/v${errorprone.version}/pom.xml
       -->
-    <errorprone.version>2.19.1</errorprone.version>
+    <errorprone.version>2.20.0</errorprone.version>
     <javac.version>9+181-r4173-1</javac.version>
   </properties>