README: Remove pytorch conda channel from README

See merge request !208

PyTorch does not support installation through the dedicated pytorch
channel anymore. See https://github.com/pytorch/pytorch/issues/138506

Fix docs

See merge request !207

Radial power spectrum freqs

See merge request !206

Update tomo

See merge request !192

* master: (35 commits)
  Fix docs: sphinx fails on `A | B` type unions.
  Bump v0.18.1
  check_fresnel_number: adjust autoscale and correct comments.
  fix format
  take out invalid frequencies
  adjusted data range for y scale and sampling of theory curves
  check_fresnel_number: fix imports and docs.
  check_fresnel_number: complete remake.
  check_fresnel_number: set default scaling to frequency.
  radial_power_spectrum: now return central bin frequency.
  pre-commit: update ruff dep to 0.10.0
  Bump version v0.18
  MedianFilter2d: remove approx notice.
  Make _MedianPool2d private. No public use intended.
  MedianFilter2d: add approximation notice in docs.
  simplifications
  updates, have to leave now
  remove further diplib traces
  removed diplib
  drop dependency on torchs _pair and _quadruple
  ...

Add CI check for numpy deprecations

Closes #49

See merge request !205

PCA: fix transpose operation for pca_synthesize_flat

See merge request !204

Fix docs: sphinx fails on `A | B` type unions.

Closes #48

See merge request !203

Even though this is valid syntax since 3.10, sphinx seems to not like
it. Switching `A | None` to `typing.Optional[A]` fixes this issue.

Further reading: https://docs.python.org/3/library/typing.html#typing.Optional

Fixes #48.

Bump v0.18.1

See merge request !202

check_fresnel_number: complete remake

See merge request !201