Use OpenJDK instead of Oracle Java

Mark Lovelessrequested to merge
mloveless-openjdk-java into master

Why is this change being made?

Oracle wants to charge GitLab team members for using Oracle Java, and OpenJDK should be used instead. This handbook update provides instructions for checking the version, and a link to detailed instructions for removal of Oracle Java. This will not impact most Linux users, but the handbook is being updated just in case.

Relevant Slack discussion: https://gitlab.slack.com/archives/C386P3PT6/p1649192424303819

Author Checklist

  • Provided a concise title for the MR
  • Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
    • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added.
  • Assign reviewers for this change to the correct DRI(s)
    • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
    • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR.
    • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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