CI: drop safety
- This does not check fdroidserver but the CI environment: https://gitlab.com/eighthave/fdroidserver/-/jobs/7610954753#L978 So the results are unrelated and have no meaning.
- ./safety check is deprecated and no longer supported since 1 May 2024 (see ./safety check --help). The replacement ./safety scan requires an account.
- This sends telemetry data by default.