chore(deps): bump openpgp from 5.11.3 to 6.1.1 in /frontend

Bumps [openpgp](https://github.com/openpgpjs/openpgpjs) from 5.11.3 to 6.1.1.
- [Release notes](https://github.com/openpgpjs/openpgpjs/releases)
- [Commits](openpgpjs/openpgpjs@v5.11.3...v6.1.1)

---
updated-dependencies:
- dependency-name: openpgp
  dependency-version: 6.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -82,7 +82,7 @@
     "light-bolt11-decoder": "^3.2.0",
     "nostr-tools": "^2.15.0",
     "npm": "^11.4.1",
-    "openpgp": "^5.11.0",
+    "openpgp": "^6.1.1",
     "react": "^19.1.0",
     "react-countdown": "^2.3.6",
     "react-dom": "^19.1.0",