Jenkins version update: allow unicode encoding

[PhilTaken]

batou_ext/src/batou_ext/jenkins.py

Line 30 in 7eac817

stdout = stdout.decode("ascii")

In cases where the remote branch name includes a unicode symbol (e.g. german umlauts) this line raises an unexpected error:

Traceback (most recent call last):
  File "<redacted>/./.appenv/9ac02331/bin/jenkins", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 137, in main
    return args.func(**func_args)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 104, in set_versions
    vu()
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 51, in __call__
    self.update(service, version)
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 65, in update
    func(service, version, args)
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 68, in update_git
    resolved = git_resolve(self.config.get(service, "url"), version)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<redacted>/.appenv/9ac02331/lib/python3.11/site-packages/batou_ext/jenkins.py", line 30, in git_resolve
    stdout = stdout.decode("ascii")
             ^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 85: ordinal not in range(128)