ci: bump publish-to-bcr version

Signed-off-by: Michael Carroll <mjcarroll@intrinsic.ai>

Author: mjcarroll

.github/workflows/publish.yaml

@@ -21,7 +21,7 @@ on:
         type: string
 jobs:
   publish:
-    uses: bazel-contrib/publish-to-bcr/.github/workflows/publish.yaml@v0.1.0
+    uses: bazel-contrib/publish-to-bcr/.github/workflows/publish.yaml@v0.2.1
     with:
       tag_name: ${{ inputs.tag_name }}
       # GitHub repository which is a fork of the upstream where the Pull Request will be opened.