apps/meet: adjust calcom-keys to apply encoding

apps/meet/calcom/calcom-keys.yaml

-apiVersion: v1
-kind: Secret
+apiVersion: secretgenerator.mittwald.de/v1alpha1
+kind: StringSecret
 metadata:
   name: stackspin-calcom-keys
   namespace: stackspout
-type: Opaque
-data:
-  DATABASE_URL: "postgresql://calcom:${postgresql_password}@calcom-postgresql/calcom"
-  NEXT_PUBLIC_WEBAPP_URL: "https://${calcom_domain}"
-  NEXTAUTH_SECRET: "${nextauth_secret}"
-  CALENDSO_ENCRYPTION_KEY: "${calendso_key}"
+spec:
+  data:
+    DATABASE_URL: "postgresql://calcom:${postgresql_password}@calcom-postgresql/calcom"
+    NEXT_PUBLIC_WEBAPP_URL: "https://${calcom_domain}"
+    NEXTAUTH_SECRET: "${nextauth_secret}"
+    CALENDSO_ENCRYPTION_KEY: "${calendso_key}"