fix: ensure vsphere password is quoted (#342)

## Description
ensure the vsphere password is quoted to avoid any yaml to json
conversion errors like the following:
```
Error: YAML parse error on validator/templates/plugin-secret-vsphere.yaml: error converting YAML to JSON: yaml: line 7: did not find expected comment or line break
```

chart/validator/templates/plugin-secret-vsphere.yaml

@@ -4,8 +4,8 @@ kind: Secret
 metadata:
   name: {{ required ".Values.pluginSecrets.vSphere.secretName is required!" .Values.pluginSecrets.vSphere.secretName }}
 stringData:
-  username: {{ required ".Values.pluginSecrets.vSphere.username is required!" .Values.pluginSecrets.vSphere.username }}
-  password: {{ required ".Values.pluginSecrets.vSphere.password is required!" .Values.pluginSecrets.vSphere.password }}
-  vcenterServer: {{ required ".Values.pluginSecrets.vSphere.vcenterServer is required!" .Values.pluginSecrets.vSphere.vcenterServer }}
+  username: {{ required ".Values.pluginSecrets.vSphere.username is required!" .Values.pluginSecrets.vSphere.username | quote }}
+  password: {{ required ".Values.pluginSecrets.vSphere.password is required!" .Values.pluginSecrets.vSphere.password | quote }}
+  vcenterServer: {{ required ".Values.pluginSecrets.vSphere.vcenterServer is required!" .Values.pluginSecrets.vSphere.vcenterServer | quote }}
   insecureSkipVerify: {{ required ".Values.pluginSecrets.vSphere.insecureSkipVerify is required!" .Values.pluginSecrets.vSphere.insecureSkipVerify | quote }}
-{{- end }}
+{{- end }}