Switch build backend to hatchling

[hoechenberger]

Before merging …

• [x] Changelog has been updated (docs/source/changes.md)

cc @ofek in case you're interested :)

[hoechenberger]

CI error due to packaging bug in MNE: forgot to include a file in the sdist

Highlights that we should run out test suites on the installed packages and not on the checked-out repository.

Cc @cbrnr

[hoechenberger]

CI error due to packaging bug in MNE: forgot to include a file in the sdist

Highlights that we should run out test suites on the installed packages and not on the checked-out repository.

Cc @cbrnr

See also https://github.com/mne-tools/mne-bids/pull/1206

Cc @drammock

[hoechenberger]

@larsoner i think this is good to go

[larsoner]

Nice @hoechenberger !