RFR: 2391: Update .github/workflows/ci.yml

[Zhao Song]

Today I received an email from Github and in the email, GitHub says they are going to remove macOS 12 runner image soon.
We should update our configuration since we are using macOS 12 runner right now.

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Commit messages:
 - SKARA-2391

Changes: https://git.openjdk.org/skara/pull/1691/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1691&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2391
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1691.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1691/head:pull/1691

PR: https://git.openjdk.org/skara/pull/1691