vuln-fix: Use HTTPS instead of HTTP to resolve deps CVE-2021-26291

This fixes a security vulnerability in this project where the `pom.xml`
files were configuring Maven to resolve dependencies over HTTP instead of
HTTPS.

Weakness: CWE-829: Inclusion of Functionality from Untrusted Control Sphere
Severity: High
CVSSS: 8.1
Detection: CodeQL & OpenRewrite (https://public.moderne.io/recipes/org.openrewrite.maven.security.UseHttpsForRepositories)

Reported-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
Signed-off-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>

Bug-tracker: JLLeitschuh/security-research#8

Co-authored-by: Moderne <team@moderne.io>

pom.xml

@@ -240,7 +240,7 @@
     <repositories>
         <repository>
             <id>java.net.m2</id>
-            <url>http://download.java.net/maven/2</url>
+            <url>https://download.java.net/maven/2</url>
             <layout>default</layout>
         </repository>
     </repositories>