unpin slsa provenance generator

There is an error when the dependency is pinned to a hash. Temporarily unpinning for v0.10.0 release.

Author: V0ldek

.github/workflows/release.yml

@@ -209,7 +209,7 @@ jobs:
 
   provenance:
     needs: [github-release]
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@a09dd8c05eda63cace134cb7dccd7e019f25e6f3 # v2.1.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v2.1.0
     permissions:
       actions: read
       id-token: write