The new version seems to be unable to handle ftp:// URLs:

$ spectool --gf libgpg-error.spec
Downloading: ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.39.tar.bz2
Download failed:
No connection adapters were found for 'ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.39.tar.bz2'
Downloading: ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.39.tar.bz2.sig
Download failed:
No connection adapters were found for 'ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-1.39.tar.bz2.sig'
- 0.0 B Elapsed Time: 0:00:00
- 0.0 B Elapsed Time: 0:00:00

I tried installing python3-requests-ftp but it didn't help:
$ rpm -qa python3-requests*
python3-requests-2.24.0-3.fc33.noarch
python3-requests_ntlm-1.1.0-12.fc33.noarch
python3-requests-download-0.1.2-4.fc33.noarch
python3-requests-gssapi-1.2.2-1.fc33.noarch
python3-requests-ftp-0.3.1-20.fc33.noarch