Fix stage 4 repo setup steps

Author: chris-elliott-nhsd

.github/workflows/stage-4-acceptance.yaml

@@ -96,6 +96,7 @@ jobs:
       - name: "Repo setup"
         run: |
           npm ci
+          (cd lambdas/authorizer && npm ci)
       - name: "Generate dependencies"
         run: |
           npm run generate-dependencies
@@ -128,6 +129,7 @@ jobs:
         run: |
           npm ci
           npm ci tests/test-team
+          (cd lambdas/authorizer && npm ci)
       - name: "Generate dependencies"
         run: |
           npm run generate-dependencies