Merge pull request #970 from playframework/mergify/bp/3.0.x/pr-969

[3.0.x] Fix `Dependency Graph` action (backport #969) by @ihostage

.github/workflows/dependency-graph.yml

@@ -21,4 +21,5 @@ jobs:
         with:
           fetch-depth: 0
           ref: ${{ inputs.ref }}
+      - uses: sbt/setup-sbt@v1
       - uses: scalacenter/sbt-dependency-submission@v3