ci: bump softprops/action-gh-release from 3.0.0 to 3.0.3

Bumps [softprops/action-gh-release](https://github.com/softprops/action-gh-release) from 3.0.0 to 3.0.3.
- [Release notes](https://github.com/softprops/action-gh-release/releases)
- [Changelog](https://github.com/softprops/action-gh-release/blob/master/CHANGELOG.md)
- [Commits](https://github.com/softprops/action-gh-release/compare/b4309332981a82ec1c5618f44dd2e27cc8bfbfda...efb35369e0ad2afab669f228072c1b0d510eae64)

---
updated-dependencies:
- dependency-name: softprops/action-gh-release
  dependency-version: 3.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/release_plugin.yml

@@ -34,7 +34,7 @@ jobs:
       # 3. Založí koncept releasu i s přílohou
       #    Tagy s pomlčkou (v2.0.0-alpha.1) se označí jako pre-release.
       - name: Create draft release with asset
-        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
+        uses: softprops/action-gh-release@efb35369e0ad2afab669f228072c1b0d510eae64 # v3.0.3
         with:
           files: amcr_viewer.zip
           draft: true