CCM-14615: add guard functions to dependency generation cache

Author: Ian-Hodges

.github/workflows/stage-2-test.yaml

@@ -117,6 +117,7 @@ jobs:
             src/digital-letters-events/types/
             src/digital-letters-events/validators/
             src/digital-letters-events/digital_letters_events/models/
+            src/digital-letters-events/guard-functions/
           key: generated-deps-${{ runner.os }}-${{ hashFiles('src/cloudevents/**', 'src/typescript-schema-generator/**', 'src/python-schema-generator/**') }}
       - name: "Generate dependencies"
         if: steps.schema-cache.outputs.cache-hit != 'true'