Update vendir carvel-dev/secretgen-controller to v0.19.2

Author: renovate[bot]

terraform-modules/concourse/backend/files/vendir.yml

@@ -8,7 +8,7 @@ directories:
   - path: .
     githubRelease:
       slug: carvel-dev/secretgen-controller
-      tag: v0.10.3
+      tag: v0.19.2
       assetNames: ["release.yml"]
     includePaths:
     - release.yml