Explicitly use version v1 of gha-scala-library-release-workflow

Author: rtyley

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
 jobs:
   scala-maven-release:
     name: Maven Release
-    uses: guardian/gha-scala-library-release-workflow/.github/workflows/reusable-release.yml@main
+    uses: guardian/gha-scala-library-release-workflow/.github/workflows/reusable-release.yml@v1
     permissions: { contents: write, pull-requests: write }
     secrets:
       SONATYPE_TOKEN: ${{ secrets.AUTOMATED_MAVEN_RELEASE_SONATYPE_TOKEN }}