gha/licensing: ensure correct go version is installed

Author: joemiller

.github/workflows/licensing.yaml

@@ -14,8 +14,13 @@ jobs:
   licensing:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: go.mod
+
       - run: sudo gem install license_finder
       - run: license_finder