Update to ubuntu 24.04 and clang-format 18

[blowekamp]

No description provided.

[blowekamp]

Currently the actions are just referring to "master". I am not sure how multiple versions can/should be supported.

InsightSoftwareConsortium/ITK#4651

[dzenanz]

With ITKv6 development started, maybe it is time for this and InsightSoftwareConsortium/ITK#3805 to move forward?

[thewtex]

We can get the same version of clang-format used with ITK's clang-format configuration and pre-commit with:

clang_format_version=$(grep -A 1 "mirrors-clang-format" ITK.pre-commit-config.yaml | tail -n 1 | cut -d: -f2 | tr -d ' v')
pixi init
pixi add python
pixi add --pypi clang-format==$clang_format_version
export PATH=$PWD/.pixi/envs/default/bin/:$PATH

@blowekamp @hjmjohnson