build(deps): bump openpgp from 5.5.0 to 5.7.0 (#924)

Bumps [openpgp](https://github.com/openpgpjs/openpgpjs) from 5.5.0 to 5.7.0.
- [Release notes](https://github.com/openpgpjs/openpgpjs/releases)
- [Commits](https://github.com/openpgpjs/openpgpjs/compare/v5.5.0...v5.7.0)

---
updated-dependencies:
- dependency-name: openpgp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -27,7 +27,7 @@
     "@actions/exec": "^1.1.1",
     "@actions/github": "^5.1.1",
     "node-fetch": "^3.3.0",
-    "openpgp": "5.5"
+    "openpgp": "5.7"
   },
   "devDependencies": {
     "@types/jest": "^27.5.0",