Update the GHA srtool-actions to the latest version (#6532)

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

@@ -40,9 +40,8 @@ jobs:
 
       - name: Build ${{ matrix.runtime }} runtime
         id: srtool_build
-        uses: chevdor/srtool-actions@v0.5.0
+        uses: chevdor/srtool-actions@v0.6.0
         with:
-          # This is the default with chevdor/srtool-actions@v0.3.0+ but we make it clear
           image: paritytech/srtool
           chain: ${{ matrix.runtime }}