Bump chevdor/srtool-actions from 0.7.0 to 0.8.0 (#7660)

Bumps [chevdor/srtool-actions](https://github.com/chevdor/srtool-actions) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/chevdor/srtool-actions/releases)
- [Commits](https://github.com/chevdor/srtool-actions/compare/v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: chevdor/srtool-actions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

polkadot/.github/workflows/release-30_publish-draft-release.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Build ${{ matrix.runtime }} runtime
         id: srtool_build
-        uses: chevdor/srtool-actions@v0.7.0
+        uses: chevdor/srtool-actions@v0.8.0
         with:
           image: paritytech/srtool
           chain: ${{ matrix.runtime }}