fix(deps): update module github.com/fluxcd/source-controller/api to v1.5.0

mentioned in merge request example-service!221 (merged)

mentioned in merge request example-service!222 (merged)

mentioned in merge request docs!122 (merged)

mentioned in merge request gitlab-org/modelops/applied-ml/code-suggestions/ai-assist!1996 (merged)

mentioned in merge request gitlab-org/security-products/secret-detection/secret-detection-service!70 (closed)

mentioned in merge request gitlab-org/security-products/secret-detection/secret-detection-service!78 (merged)