v2.3.0

Changelog

New tests

• test_faketime verifies client is compatible with test suites time faking approach
• test_static_repository[sigstore-root-signing]: Sigstore TUF repo added as static test
• test_artifact_cache: verifies that client caches artifacts. Artifact caching is not required by specification so clients should mark this one expected to fail if they do not support caching

Internal changes

• Fake time implementation was refactored
• Static test repositories can now set a fake time (to enable static repositories with short expiries)
• All test suite infrastructure code was moved to a sub directory: test code should be easier to browse now