chore(deps): update softprops/action-gh-release action to v2

Author: renovate[bot]

.github/workflows/release-sigstore-gradle-plugin-from-tag.yaml

@@ -64,7 +64,7 @@ jobs:
       contents: write
     steps:
       - name: Create release
-        uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # tag=v0.1.15
+        uses: softprops/action-gh-release@9d7c94cfd0a1f3ed45544c887983e9fa900f0564 # v2.0.4
         with:
           tag_name: ${{ github.ref_name }}
           name: ${{ github.ref_name }}-gradle

.github/workflows/release-sigstore-java-from-tag.yaml

@@ -65,7 +65,7 @@ jobs:
       contents: write
     steps:
       - name: Create release
-        uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # tag=v0.1.15
+        uses: softprops/action-gh-release@9d7c94cfd0a1f3ed45544c887983e9fa900f0564 # v2.0.4
         with:
           tag_name: ${{ github.ref_name }}
           body: "See [CHANGELOG.md](https://github.com/${{ vars.GITHUB_REPOSITORY }}/blob/main/CHANGELOG.md) for more details."