[No Ticket]: Change GitHub actions to use macos-12

[JeffreyHuynh1]

Overview

Previously we were using macos-latest for our macos runners. However, there are migrations to use ARM instead of AMD for macos-latest.

It has caused this test to fail:

• https://github.com/fossas/fossa-cli/actions/runs/8852343990

You can see that github has updated macos-latest here:

• https://github.blog/changelog/2024-04-01-macos-14-sonoma-is-generally-available-and-the-latest-macos-runner-image/

Changing to macos-12 to be conservative and based on the suggestion here:

• https://github.com/actions/runner-images/blob/main/README.md#latest-migration-process

Testing plan

• Test via GH actions

Risks

Metrics

References

Checklist

• I added tests for this PR's change (or explained in the PR description why tests don't make sense).
• If this PR introduced a user-visible change, I added documentation into docs/.
• If this PR added docs, I added links as appropriate to the user manual's ToC in docs/README.ms and gave consideration to how discoverable or not my documentation is.
• If this change is externally visible, I updated Changelog.md. If this PR did not mark a release, I added my changes into an # Unreleased section at the top.
• If I made changes to .fossa.yml or fossa-deps.{json.yml}, I updated docs/references/files/*.schema.json AND I have updated example files used by fossa init command. You may also need to update these if you have added/removed new dependency type (e.g. pip) or analysis target type (e.g. poetry).
• If I made changes to a subcommand's options, I updated docs/references/subcommands/<subcommand>.md.

[csasarak]

This is working for me. After merging please download the binaries and test again before cutting a release.