build: fixing provenance workflow by removing runs-on parameter which…

… conflicts with uses (#267)

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.github/workflows/manual-publish.yml

@@ -42,7 +42,6 @@ jobs:
 
   release-provenance:
     needs: [ 'build-publish' ]
-    runs-on: ubuntu-latest
     permissions:
       actions: read
       id-token: write

.github/workflows/release-please.yml

@@ -60,7 +60,6 @@ jobs:
   release-provenance:
     needs: [ 'release-package' ]
     if: ${{ needs.release-package.outputs.release-created }}
-    runs-on: ubuntu-latest
     permissions:
       actions: read
       id-token: write