switch from Jest to Vitest

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__mocks__/@actions/github.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {jest} from '@jest/globals';
+import {vi} from 'vitest';
 
 export const context = {
   repo: {
@@ -221,4 +221,4 @@ export const context = {
   }
 };
 
-export const getOctokit = jest.fn();
+export const getOctokit = vi.fn();