Bump steep from 1.8.0 to 1.8.1 in /gemfiles/typecheck

Bumps [steep](https://github.com/soutaro/steep) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/soutaro/steep/releases)
- [Changelog](https://github.com/soutaro/steep/blob/master/CHANGELOG.md)
- [Commits](soutaro/steep@v1.8.0...v1.8.1)

---
updated-dependencies:
- dependency-name: steep
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

gemfiles/typecheck/Gemfile.lock

@@ -20,7 +20,8 @@ GEM
     csv (3.3.0)
     drb (2.2.1)
     erubi (1.13.0)
-    ffi (1.17.0)
+    ffi (1.17.0-arm64-darwin)
+    ffi (1.17.0-x86_64-linux-gnu)
     fileutils (1.7.2)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
@@ -69,7 +70,7 @@ GEM
       prism (>= 0.28.0)
       sorbet-static-and-runtime (>= 0.5.10187)
       thor (>= 0.19.2)
-    steep (1.8.0)
+    steep (1.8.1)
       activesupport (>= 5.1)
       concurrent-ruby (>= 1.1.10)
       csv (>= 3.0.9)