feat: update Maven image version in GitLab CI configuration

.gitlab-ci.yml

@@ -8,7 +8,7 @@ variables:
 
 build:
   stage: build
-  image: maven:3.8.7-openjdk-21
+  image: maven:3.9.9-eclipse-temurin-21
   script:
     - mvn $MAVEN_CLI_OPTS clean package
     - BUILD_DATE=$(date -u +${DATE_FORMAT})