fix(notice-choice): switch attribute to snake case (#12147)

### Related Ticket(s)

Follow up to #12127

### Description

Following convention, switch `current-language` attribute to snake case.

### Changelog

**Changed**

- Changed `currentLanguage` attribute in `<c4d-notice-choice>` component to snake case

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packages/web-components/src/components/notice-choice/notice-choice.ts

@@ -56,7 +56,7 @@ class NoticeChoice extends StableSelectorMixin(LitElement) {
   @property({ type: String, attribute: 'language' })
   language = 'en';
 
-  @property({ type: String, attribute: 'currentLanguage' })
+  @property({ type: String, attribute: 'current-language' })
   currentLanguage = 'en';
 
   @property({ type: String, attribute: 'terms-condition-link' })