fix: ci/cd 테스터 대상 수정

Author: changs97

.github/workflows/android.yml

@@ -215,7 +215,7 @@ jobs:
       with:
         appId: ${{secrets.FIREBASE_APP_ID}}
         serviceCredentialsFileContent: ${{ secrets.CREDENTIAL_FILE_CONTENT }}
-        groups: testers,beta-testers
+        groups: testers
         file: app/build/outputs/apk/prod/release/app-prod-release.apk
         releaseNotes: |
           🚀 RunCombi Android v${{ steps.app_version.outputs.version_name }} 배포 완료!