chore(deps): update sigstore/sigstore-conformance action to v0.0.20

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This PR contains the following updates:

Package	Type	Update	Change
sigstore/sigstore-conformance	action	patch	v0.0.19 -> v0.0.20

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Release Notes

sigstore/sigstore-conformance (sigstore/sigstore-conformance)

v0.0.20

Compare Source

What's Changed

the sign command of the CLI protocol now contains optional --signing-config and --trusted-root arguments: This feature is used in the new signing test, users should update their client-under-test CLI implementations (or alternatively mark the test as XFAILed if the underlying client is incompatible). See CLI protocol for more details.

Added tests

• Multiple new verification tests for rekor2 entries
• Signing test for rekor2 entries

Full Changelog: sigstore/sigstore-conformance@v0.0.19...v0.0.20

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