chore(deps): bump org.apache.maven.plugins:maven-compiler-plugin (#2195)

Bumps [org.apache.maven.plugins:maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin) from 3.11.0 to 3.12.1.
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](apache/maven-compiler-plugin@maven-compiler-plugin-3.11.0...maven-compiler-plugin-3.12.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-compiler-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

sample-operators/leader-election/pom.xml

@@ -81,7 +81,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.11.0</version>
+                <version>3.12.1</version>
             </plugin>
             <plugin>
                 <!-- Generate Java code from the custom resource definitions -->

sample-operators/mysql-schema/pom.xml

@@ -108,7 +108,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.11.0</version>
+                <version>3.12.1</version>
             </plugin>
         </plugins>
     </build>

sample-operators/tomcat-operator/pom.xml

@@ -110,7 +110,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.11.0</version>
+                <version>3.12.1</version>
             </plugin>
         </plugins>
     </build>

sample-operators/webpage/pom.xml

@@ -81,7 +81,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.11.0</version>
+                <version>3.12.1</version>
             </plugin>
         </plugins>
     </build>