Thank you very much. I removed the directory and updated to a8eb9d15 without error.

UPDATE: the issue is a follow up of invalid version identifiers / read #2120 (comment) to solve the issue.

Okay, I did that. Now when I try to update:

fetch from https://github.com/searxng/searxng and reset to origin/master
...
  |searxng| HEAD is now at 674dae94 Merge pull request #2119 from dalf/weblate_codeberg
...

now we are at 674dae9 ..

I have redis 4.4.2, not 4.4.0.

Obtaining file:///usr/local/searxng/searxng-src
...
pip._vendor.pkg_resources.ContextualVersionConflict: 
  (redis 4.4.2 (/usr/local/searxng/searx-pyenv/lib/python3.9/site-packages), 
  Requirement.parse('redis==4.4.0'), {'searxng'})

Strange, I do not understand that requirement Requirement.parse('redis==4.4.0'), {'searxng'} .. when we look at 674dae9 ...

.. redis 4.4.2 is required.

Did you modified files in your installation at file:///usr/local/searxng/searxng-src?

Should I just reinstall?

May be re-install is more trivial compared to dig deeper in this issue .. but before reinstall, I think we have to consolidate our mess around the version identifier first (this was your initial issue) --> #2122

Okay, I did that. Now when I try to update:
https://pastebin.com/DTH8C8Yv
I have redis 4.4.2, not 4.4.0. What is going on? Should I just reinstall?

can you try to replace this line

    git_commit_date_hash = subprocess_run(r"git show -s --date='format:%Y.%-m.%-d' --format='%cd+%h'")

?

Notice the additional - after %. I will look after this issue tomorrow.