chore(ci): bump actions/checkout from 3 to 7 - #748

Warning: Code scanning cannot determine the alerts introduced by this pull request, because 3 configurations present on refs/heads/main were not found:

Actions workflow (release.yml)

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Actions workflow (rust-test.yml)

• ❓  .github/workflows/rust-test.yml:ci

Actions workflow (all-tests.yml)

• ❓  .github/workflows/all-tests.yml:ci

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