fix: add gcc-12-base as an essential copyright for others

[cjdcordeiro]

Proposed changes

Some libraries are copyrighted with the gcc-12-base_copyright slice.

Forward porting

Already applied in 24.04

Checklist

• [x] I have read the contributing guidelines

• [ ] I have tested my changes (see how) No functional testing applies here

• [x] I have already submitted the CLA form

[github-actions[bot]]

Diff of dependencies: None found.

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