Bump softprops/action-gh-release from 2 to 3 (#4)

Bumps [softprops/action-gh-release](https://github.com/softprops/action-gh-release) from 2 to 3.
- [Release notes](https://github.com/softprops/action-gh-release/releases)
- [Changelog](https://github.com/softprops/action-gh-release/blob/master/CHANGELOG.md)
- [Commits](softprops/action-gh-release@v2...v3)

---
updated-dependencies:
- dependency-name: softprops/action-gh-release
  dependency-version: '3'
  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>

Author: dependabot[bot]

.github/workflows/gradle.yaml

@@ -47,6 +47,6 @@ jobs:
         run: mkdir staging && cp build/libs/ModMail.jar staging && mv staging/ModMail.jar staging/ModMail_${{ github.event.release.tag_name }}.jar
       - name: Upload jar to Release
         if: ${{ github.event_name == 'release' }}
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         with:
           files: staging/ModMail_${{ github.event.release.tag_name }}.jar