Update version of CLA check

Fixes #398

Author: robert-ancell

.github/workflows/cla-check.yaml

@@ -6,4 +6,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check if CLA signed
-        uses: canonical/has-signed-canonical-cla@v1
+        uses: canonical/has-signed-canonical-cla@v2