fix: upgrade @sigstore/mock from 0.7.4 to 0.10.0

Snyk has created this PR to upgrade @sigstore/mock from 0.7.4 to 0.10.0.

See this package in npm:
@sigstore/mock

See this project in Snyk:
https://app.snyk.io/org/nerds-github/project/00eaf84d-a05e-4e1a-923e-697960352bb8?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

packages/attest/package.json

@@ -35,7 +35,7 @@
     "url": "https://github.com/actions/toolkit/issues"
   },
   "devDependencies": {
-    "@sigstore/mock": "^0.7.4",
+    "@sigstore/mock": "^0.10.0",
     "@sigstore/rekor-types": "^2.0.0",
     "@types/jsonwebtoken": "^9.0.6",
     "nock": "^13.5.1",