mintmaker: Fix YAML type error in mintmaker manager patch (#7612)

Change ENABLE_PROFILING env var value from boolean `true` to string
`"true"` to resolve ArgoCD sync failure. Kubernetes env vars must be
strings.

Author: qixiang

components/mintmaker/staging/base/manager_patch.yaml

@@ -22,4 +22,4 @@ spec:
             memory: 256Mi
         env:
         - name: ENABLE_PROFILING
-          value: true
+          value: "true"