Fixed deprecated ednpoints.

## Summary
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## Additional Information
<!-- Any additional information like breaking changes, dependencies added, screenshots, comparisons between new and old behavior, etc. -->

test/copy-trading/public.read.test.ts

@@ -26,8 +26,4 @@ describe('Public Copy Trading REST API Endpoints', () => {
   it('getServerTime()', async () => {
     expect(await api.getServerTime()).toMatchObject(successResponseObject());
   });
-
-  it('getAnnouncements()', async () => {
-    expect(await api.getAnnouncements()).toMatchObject(successResponseObject());
-  });
 });

test/unified-margin/public.read.test.ts

@@ -104,8 +104,4 @@ describe('Public Unified Margin REST API Endpoints', () => {
   it('getServerTime()', async () => {
     expect(await api.getServerTime()).toMatchObject(successResponseObject());
   });
-
-  it('getAnnouncements()', async () => {
-    expect(await api.getAnnouncements()).toMatchObject(successResponseObject());
-  });
 });