fix: pass version-file to release-please action (#36)

release-please-config.json's version-file is ignored when
release-type is specified in the workflow with: block. Pass
version-file directly to the action so VERSION is updated
on each release.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: locus313

.github/workflows/release.yml

@@ -16,3 +16,4 @@ jobs:
       - uses: googleapis/release-please-action@45996ed1f6d02564a971a2fa1b5860e934307cf7 # v5
         with:
           release-type: simple
+          version-file: VERSION