fix: EndpointProtocol setting item does not take effect (#10)

Fixes https://github.com/halo-sigs/plugin-s3/issues/9
```release-note
fix endpointProtocol setting item does not take effect
```

gradle.properties

@@ -1 +1 @@
-version=1.2.0-SNAPSHOT
+version=1.2.1-SNAPSHOT

src/main/resources/extensions/policy-template-s3os.yaml

@@ -19,7 +19,7 @@ spec:
           label: Bucket 桶名称
           validation: required
         - $formkit: select
-          name: endpoint_protocol
+          name: endpointProtocol
           label: Endpoint 访问协议
           options:
             - label: HTTPS

src/main/resources/plugin.yaml

@@ -4,7 +4,7 @@ metadata:
   name: PluginS3ObjectStorage
 spec:
   enabled: true
-  version: 1.2.0
+  version: 1.2.1
   requires: ">=2.0.0"
   author:
     name: longjuan