fix(helm): Apply fix from #14126 to example (#20252)

Signed-off-by: jabdoa2 <jabdoa2@users.noreply.github.com>
Co-authored-by: J Stickler <julie.stickler@grafana.com>

Author: jabdoa2

production/helm/loki/single-binary-values.yaml

@@ -4,7 +4,7 @@ loki:
     replication_factor: 1
   schemaConfig:
     configs:
-      - from: 2024-04-01
+      - from: "2024-04-01"
         store: tsdb
         object_store: s3
         schema: v13