Add Maven plugin dependencies to auto-merge group

- Added 11 Maven plugin dependencies to auto-merge-minor-and-patch group
- Includes maven-checkstyle-plugin, maven-compiler-plugin, maven-failsafe-plugin, maven-gpg-plugin, maven-javadoc-plugin, maven-release-plugin, maven-source-plugin, maven-surefire-plugin, lifecycle-mapping, jacoco-maven-plugin, and central-publishing-maven-plugin
- Total Maven dependencies now: 35 (24 runtime + 11 plugins)
- Plugins follow semantic versioning and minor/patch updates are safe to auto-merge with CI validation

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -29,8 +29,19 @@ updates:
           - "io.jsonwebtoken:jjwt-jackson"
           - "io.netty:netty-resolver-dns-native-macos"
           - "jakarta.validation:jakarta.validation-api"
+          - "org.apache.maven.plugins:maven-checkstyle-plugin"
+          - "org.apache.maven.plugins:maven-compiler-plugin"
+          - "org.apache.maven.plugins:maven-failsafe-plugin"
+          - "org.apache.maven.plugins:maven-gpg-plugin"
+          - "org.apache.maven.plugins:maven-javadoc-plugin"
+          - "org.apache.maven.plugins:maven-release-plugin"
+          - "org.apache.maven.plugins:maven-source-plugin"
+          - "org.apache.maven.plugins:maven-surefire-plugin"
+          - "org.eclipse.m2e:lifecycle-mapping"
           - "org.hibernate.validator:hibernate-validator"
+          - "org.jacoco:jacoco-maven-plugin"
           - "org.projectlombok:lombok"
+          - "org.sonatype.central:central-publishing-maven-plugin"
           - "org.springframework.boot:spring-boot-autoconfigure"
           - "org.springframework.boot:spring-boot-devtools"
           - "org.springframework.boot:spring-boot-jackson2"