Bump marked and marked-gfm-heading-id

Bumps [marked](https://github.com/markedjs/marked) and [marked-gfm-heading-id](https://github.com/markedjs/marked-gfm-heading-id). These dependencies needed to be updated together.

Updates `marked` from 12.0.2 to 14.1.2
- [Release notes](https://github.com/markedjs/marked/releases)
- [Changelog](https://github.com/markedjs/marked/blob/master/.releaserc.json)
- [Commits](markedjs/marked@v12.0.2...v14.1.2)

Updates `marked-gfm-heading-id` from 3.2.0 to 4.1.0
- [Release notes](https://github.com/markedjs/marked-gfm-heading-id/releases)
- [Changelog](https://github.com/markedjs/marked-gfm-heading-id/blob/main/release.config.cjs)
- [Commits](markedjs/marked-gfm-heading-id@v3.2.0...v4.1.0)

---
updated-dependencies:
- dependency-name: marked
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: marked-gfm-heading-id
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -61,8 +61,8 @@
     "@vaadin/router": "^1.7.5",
     "firebase": "^10.13.1",
     "lit": "^3.2.0",
-    "marked": "^12.0.2",
-    "marked-gfm-heading-id": "^3.2.0",
+    "marked": "^14.1.2",
+    "marked-gfm-heading-id": "^4.1.0",
     "pwa-helpers": "^0.9.1",
     "register-service-worker": "^1.7.2",
     "web-vitals": "^3.5.2"