Bump github.com/sigstore/sigstore-go from 1.2.0 to 1.2.1

[dependabot]

Bumps github.com/sigstore/sigstore-go from 1.2.0 to 1.2.1.

Release notes

Sourced from github.com/sigstore/sigstore-go's releases.

v1.2.1

What's Changed

v1.2.1 resolves GHSA-wqqc-jjcq-vfxm.

• Check signature time against public key validity window in sigstore/sigstore-go#642

Full Changelog: sigstore/sigstore-go@v1.2.0...v1.2.1

Commits

• 4594ab4 Check signature time against public key validity window (#642)
• 3ad400c Bump actions/checkout from 6.0.2 to 6.0.3 (#639)
• See full diff in compare view

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