Merge pull request #1071 from sigstore/renovate/sigstore-sigstore-conformance-0.x

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

Author: loosebazooka

.github/workflows/conformance.yml

@@ -54,7 +54,7 @@ jobs:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'
 
-      - uses: sigstore/sigstore-conformance@a7ac671d8e55553de127c8b1ad96d8d416315e83 # v0.0.19
+      - uses: sigstore/sigstore-conformance@1d8b0cdd88fa7fb5a8510e51faf6ccad8c96f10a # v0.0.20
         with:
           entrypoint: ${{ github.workspace }}/sigstore-cli/sigstore-cli-server
           environment: ${{ matrix.sigstore-env }}