Describe the bug
The version of gpg is not retrieved when certain gpg config options are present.

To Reproduce
Steps to reproduce the behavior:

1. Create a gpg config file in ~/.gnupg/gpg.conf with a group defined (e.g., group somegroup = D8AFDDA07A5B6EDFA7D8CCDAD6D055F927843F1C)
2. python -c 'import gnupg; gnupg.GPG().list_keys()'

Expected behavior
No crash

Actual behavior
Crash

$ python -c 'import gnupg; gnupg.GPG().list_keys()'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import gnupg; gnupg.GPG().list_keys()
                  ~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/gnupg.py", line 1835, in list_keys
    if self.version >= (2, 1):
       ^^^^^^^^^^^^^^^^^^^^^^
TypeError: '>=' not supported between instances of 'NoneType' and 'tuple'

Environment

• Arch Linux
• gpg 2.4.7
• python-gnupg 0.5.4

Additional information
Groups are reported in the gpg output before the version:

$ gpg --list-config --with-colons
cfg:group:somegroup:D8AFDDA07A5B6EDFA7D8CCDAD6D055F927843F1C
cfg:version:2.4.7
cfg:pubkey:1;16;17;18;19;22
cfg:pubkeyname:RSA;ELG;DSA;ECDH;ECDSA;EDDSA
[..snip..]

When checking the version, python-gnupg retrieves all options, but the version checking regex assumes that the first output is the version: