Bump signpath/github-action-submit-signing-request from 1.3 to 2.0 (#597)

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

.github/workflows/build.yml

@@ -110,7 +110,7 @@ jobs:
           path: output/gopher64-${{ matrix.arch }}.exe
       - name: SignPath
         if: ${{ github.ref_type == 'tag' }}
-        uses: signpath/github-action-submit-signing-request@v1.3
+        uses: signpath/github-action-submit-signing-request@v2.0
         with:
           api-token: "${{ secrets.SIGNPATH_API_TOKEN }}"
           organization-id: "${{ secrets.SIGNPATH_ORG_ID }}"