Updated the project.

my-app/node_modules/@sigstore/verify/dist/bundle/index.js

@@ -49,5 +49,10 @@ function key(bundle) {
                 certificate: core_1.X509Certificate.parse(bundle.verificationMaterial.content.x509CertificateChain
                     .certificates[0].rawBytes),
             };
+        case 'certificate':
+            return {
+                $case: 'certificate',
+                certificate: core_1.X509Certificate.parse(bundle.verificationMaterial.content.certificate.rawBytes),
+            };
     }
 }