Remove `dependencies` keyword from Maven & Gradle examples

Since 12.6, it `needs` and `dependencies` are conflicting keywords:
https://docs.gitlab.com/ee/ci/yaml/#artifact-downloads-with-needs

doc/user/project/merge_requests/test_coverage_visualization.md

@@ -177,8 +177,6 @@ coverage-jdk11:
     # convert report from jacoco to cobertura, using relative project path
     - python /opt/cover2cover.py target/site/jacoco/jacoco.xml $CI_PROJECT_DIR/src/main/java/ > target/site/cobertura.xml
   needs: ["test-jdk11"]
-  dependencies:
-    - test-jdk11
   artifacts:
     reports:
       cobertura: target/site/cobertura.xml
@@ -215,8 +213,6 @@ coverage-jdk11:
     # convert report from jacoco to cobertura, using relative project path
     - python /opt/cover2cover.py build/jacoco/jacoco.xml $CI_PROJECT_DIR/src/main/java/ > build/cobertura.xml
   needs: ["test-jdk11"]
-  dependencies:
-    - test-jdk11
   artifacts:
     reports:
       cobertura: build/cobertura.xml