Fix the problem of upgrading plugins with same version (#3836)

#### What type of PR is this?

/kind bug
/area plugin
/area core

#### What this PR does / why we need it:

Close file system after reading plugin descriptor.

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/3720

#### How to test?

1. Build a plugin and install it
2. Update plugin.yaml of the plugin, rebuild and upgrade it
3. Check the change you modified

#### Does this PR introduce a user-facing change?

```release-note
修复无法正常升级插件的问题
```

application/src/main/java/run/halo/app/plugin/YamlPluginFinder.java

@@ -73,6 +73,7 @@ public class YamlPluginFinder {
 
     protected Plugin readPluginDescriptor(Path pluginPath) {
         Path propertiesPath = getManifestPath(pluginPath, propertiesFileName);
+        try {
             if (propertiesPath == null) {
                 throw new PluginRuntimeException("Cannot find the plugin manifest path");
             }
@@ -83,6 +84,9 @@ public class YamlPluginFinder {
             }
             Resource propertyResource = new FileSystemResource(propertiesPath);
             return unstructuredToPlugin(propertyResource);
+        } finally {
+            FileUtils.closePath(propertiesPath);
+        }
     }
 
     protected Plugin unstructuredToPlugin(Resource propertyResource) {