Add strict values.schema.json to gotenberg

additionalProperties: false on every chart-owned object level, so a key
the chart does not read is rejected at render time instead of being
silently ignored. Objects passed verbatim into the pod spec (probes,
securityContext, global) stay open - Kubernetes owns their schema there.

Major bump: a schema can break existing deployments that carry dead keys.

Refs #68

gotenberg/Chart.yaml

@@ -5,7 +5,7 @@ icon: https://gotenberg.dev/img/logo.png
 
 type: application
 
-version: 4.2.0+up8.36.0
+version: 5.0.0+up8.36.0
 appVersion: "8.36.0"
 
 maintainers: