ios: avoid default keychain mutation in ci

.gitea/workflows/testflight-release.yml

@@ -94,7 +94,6 @@ jobs:
           security set-keychain-settings -lut 21600 "${keychain_path}"
           security unlock-keychain -p "${keychain_password}" "${keychain_path}"
           security list-keychains -d user -s "${keychain_path}" $(security list-keychains -d user | sed 's/[ "]//g')
-          security default-keychain -s "${keychain_path}"
           security import ios/build/secrets/appstore-signing.p12 \
             -k "${keychain_path}" \
             -P "${APPSTORE_CERTIFICATES_PASSWORD}" \