changelog: https://github.com/conda/conda-libmamba-solver/blob/26.4.2/CHANGELOG.md

diff: https://github.com/conda/conda-libmamba-solver/compare/25.11.0...26.4.2

This commit was automatically generated using update-python-libraries.

Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:

  nix-build ci -A fmt.check

This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).

This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).

Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](https://github.com/NixOS/nixpkgs/tree/8616af08d915377bd930395f3b700a0e93d08728/maintainers/scripts/auto-rebase).

If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.

Made with

```shell
git restore .
fd '\.nix$' pkgs/ --type f -j1 -x bash -xc "$(cat <<"EOF"
    typos --no-check-filenames --write-changes "$1"
    git diff --exit-code "$1" && exit
    #( git diff "$1" | grep -qE "^\+ +[^# ]") && git restore "$1"
    count1="$( bat --language nix --diff --style changes "$1" --theme "Monokai Extended" --color always | aha --no-header | grep -E '^<span style="color:olive;">~</span> ' | wc -l )"
    count2="$( bat --language nix --diff --style changes "$1" --theme "Monokai Extended" --color always | aha --no-header | grep -E '^<span style="color:olive;">~</span> (<span style="color:#f8f8f2;"> *</span>)?<span style="color:#75715e;">.*</span>$' | wc -l )"
    [[ $count1 -ne $count2 ]] && git restore "$1"
EOF
)" -- {}
```

and filtered with `GIT_DIFF_OPTS='--unified=15' git -c interactive.singleKey=true add --patch`

I initially tried using the tree-sitter cli, python bindings and even ast-grep through various means, but this is what I ended up with.