Bump the backend-dev group across 3 directories with 1 update

Bumps the backend-dev group with 1 update in the / directory: [org.apache.maven.plugins:maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin).
Bumps the backend-dev group with 1 update in the /client directory: [org.apache.maven.plugins:maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin).
Bumps the backend-dev group with 1 update in the /server directory: [org.apache.maven.plugins:maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin).


Updates `org.apache.maven.plugins:maven-compiler-plugin` from 3.14.1 to 3.15.0
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](apache/maven-compiler-plugin@maven-compiler-plugin-3.14.1...maven-compiler-plugin-3.15.0)

Updates `org.apache.maven.plugins:maven-compiler-plugin` from 3.14.1 to 3.15.0
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](apache/maven-compiler-plugin@maven-compiler-plugin-3.14.1...maven-compiler-plugin-3.15.0)

Updates `org.apache.maven.plugins:maven-compiler-plugin` from 3.14.1 to 3.15.0
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](apache/maven-compiler-plugin@maven-compiler-plugin-3.14.1...maven-compiler-plugin-3.15.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-compiler-plugin
  dependency-version: 3.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: backend-dev
- dependency-name: org.apache.maven.plugins:maven-compiler-plugin
  dependency-version: 3.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: backend-dev
- dependency-name: org.apache.maven.plugins:maven-compiler-plugin
  dependency-version: 3.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: backend-dev
...

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

Author: dependabot[bot]

pom.xml

@@ -28,7 +28,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.14.1</version>
+                <version>3.15.0</version>
                 <configuration>
                     <release>21</release>
                 </configuration>