fix(helmchart): use literal KOTS template syntax for VersionLabel

Replaced Helm escape sequences with the literal repl{{ .VersionLabel }}
string. helmchart.yaml is a KOTS manifest uploaded directly to
Replicated — it is never processed by Helm, so Go template escaping
was incorrect and caused a parse error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aa-replicated

helmchart.yaml

@@ -8,7 +8,7 @@ spec:
     chartVersion: ""
   values:
     image:
-      tag: repl{{ '{{' }} .VersionLabel {{ '}}' }}
+      tag: repl{{ .VersionLabel }}
     global:
       imagePullSecrets:
         - name: '{{repl ImagePullSecretName }}'