Increase material for mkdocs version to 6.0.2

mkdocs:

  image:

    name: squidfunk/mkdocs-material:5.2.2

    name: squidfunk/mkdocs-material:6.0.2

    entrypoint: [""]

  stage: build

  variables:

    MKDOCS_OUTPUT_PATH: 'documentation_build/'

  script:

    - pip3 install mkdocs-git-revision-date-localized-plugin==0.7.2

    - mkdocs build -d "$MKDOCS_OUTPUT_PATH"

  artifacts:

    when: always

* Update material for mkdocs version to 6.0.2

* Manually install mkdocs-git-revision-date-localized-plugin since it's no more included in material for mkdocs docker image