Bump signpath/github-action-submit-signing-request from 1.3 to 2.0

Bumps [signpath/github-action-submit-signing-request](https://github.com/signpath/github-action-submit-signing-request) from 1.3 to 2.0.
- [Release notes](https://github.com/signpath/github-action-submit-signing-request/releases)
- [Commits](https://github.com/signpath/github-action-submit-signing-request/compare/v1.3...v2.0)

---
updated-dependencies:
- dependency-name: signpath/github-action-submit-signing-request
  dependency-version: '2.0'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/package.yml

@@ -390,7 +390,7 @@ jobs:
           if-no-files-found: error
 
       - name: Sign package artifacts
-        uses: signpath/github-action-submit-signing-request@v1.3
+        uses: signpath/github-action-submit-signing-request@v2.0
         with:
           api-token: '${{ secrets.SIGNPATH_API_TOKEN }}'
           organization-id: '3b533e02-73c3-4908-a018-d09a34498a6a'