bump version to 5.12

[pdurbin]

What this PR does / why we need it:

Bumps the version to 5.12.

Which issue(s) this PR closes:

Closes #8980

Special notes for your reviewer:

None.

Suggestions on how to test this:

I checked these already but:

• make sure you see 5.12 at http://localhost:8080/api/info/version
• check for 5.12 at top of html/index.html
  • preview at https://dataverse-guide--9004.org.readthedocs.build/en/9004/index.html
• check new link at build/html/versions.html
  • preview at https://dataverse-guide--9004.org.readthedocs.build/en/9004/versions.html

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

No.

Is there a release notes update needed for this change?:

No.

Additional documentation:

None.

[qqmyers]

Looks like the same changes as for 5.11.1

[pdurbin]

At https://jenkins.dataverse.org/job/IQSS-Dataverse-Develop-PR/job/PR-9004/1/consoleFull I'm seeing this:

TASK [dataverse : copy warfile over release] ***********************************
fatal: [localhost]: FAILED! => {"changed": false, "msg": "Source /tmp/dataverse/target/dataverse-5.11.1.war not found"}

On the Ansible side I think we need a bump like this: gdcc/dataverse-ansible@5f08dc4

I created an issue:

• version bump for 5.12 gdcc/dataverse-ansible#258

Thank you for any assistance @donsizemore ! ❤️

[pdurbin]

@donsizemore bumped jenkin.yml for me (thanks!) in gdcc/dataverse-ansible@c382f03

I re-ran the job and it's passing now: https://jenkins.dataverse.org/job/IQSS-Dataverse-Develop-PR/job/PR-9004/2/testReport/

[pdurbin]

For next time this is my suggested recipe (I think):

• ensure develop is passing
• bump jenkins.yml in Ansible
• create PR to bump Dataverse, ensure tests pass
• review and merge PR to bump Dataverse
• ensure develop is passing
• merge develop to master, ensure tests pass
• make release, upload artifacts
• bump main.yml, etc. in Ansible