Update gcp-secret-manager module

Bump to use latest 4.0 gcp-secret-manager modules. This is to fix issues encountered with the following error which is now fixed in the later version:

• gcp-secret-manager#8 (closed)

added chore issuetypeBug priority2 Medium teamCloud workflowIn Progress labels

changed iteration to Cloud Team Sprints Apr 10, 2024 - Apr 23, 2024

assigned to @rh841

removed iteration Cloud Team Sprints Apr 10, 2024 - Apr 23, 2024

changed iteration to Cloud Team Sprints Apr 24, 2024 - May 7, 2024

removed iteration Cloud Team Sprints Apr 24, 2024 - May 7, 2024

changed iteration to Cloud Team Sprints May 8, 2024 - May 21, 2024

removed iteration Cloud Team Sprints May 8, 2024 - May 21, 2024

No longer important - putting back into backlog

added priority4 Lowest workflowbacklog labels and removed priority2 Medium workflowIn Progress labels

closed

already using the latest 4.0: https://gitlab.developers.cam.ac.uk/uis/devops/infra/terraform/gcp-scheduled-script/-/blob/master/main.tf?ref_type=heads#L96