Use Java 17 by default

What does this MR do?

Use Java 17 and Gradle 7.3.3 by default

Note: This is a breaking change! Any project that uses a build.gradle with a directive that is no longer supported by gradle 7, such as compile or runtime, will fail. See here for a list of common configuration commands that are no longer supported in gradle 7.

To work around this, you'll need to set DS_JAVA_VERSION to a version of Java which uses a compatible version of gradle. See the note on the Pre-installed Versions of gradle in the Dependency Scanning documentation for more details.

What are the relevant issue numbers?

gitlab-org/gitlab#362299 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer