MAINT: Follow Nep29, bump minimum numpy.

[Carreau]

As usual this is open for discussion.
See previous thread in #5089.

Also add a Nep29 badge to the readme.

for info Nep29 suggests:

On Jan 31, 2023 drop support for NumPy 1.20 (initially released on Jan 31, 2021)

This also remove any conditional branching based on numpy version.

Note that this is technically a change of API ad DTypeLiike is not exposed by napari.types anymore. I did not manage to keep it there as ruff is removing is as an unused import. I think that's ok as this was likely only used internally.

Type of change

• Bug-fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

References

https://numpy.org/neps/nep-0029-deprecation_policy.html

Final checklist:

• My PR is the minimum possible work for the desired functionality
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• If I included new strings, I have used trans. to make them localizable.
  For more information see our translations guide.

[Czaki]

Looks ok for me.
As it removes conditional imports it is improvement for me.

As I do not know when the next release will be I'm ok with fast merge.

[Carreau]

The ubuntu archive seem to have been down.
GitHub does not seem happy about it and won't let me restart the failing workflow for now... I'll do it later.

[codecov]

Codecov Report

Merging #5532 (7cc29e2) into main (6d27f81) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5532   +/-   ##
=======================================
  Coverage   89.40%   89.41%           
=======================================
  Files         609      609           
  Lines       51146    51136   -10     
=======================================
- Hits        45729    45721    -8     
+ Misses       5417     5415    -2     

Impacted Files	Coverage Δ
napari/_tests/utils.py	100.00% <ø> (+2.19%)	⬆️
napari/layers/_data_protocols.py	100.00% <ø> (ø)
napari/components/_tests/test_layer_slicer.py	97.98% <100.00%> (-1.21%)	⬇️
napari/types.py	90.19% <100.00%> (+4.23%)	⬆️
napari/components/experimental/chunk/_pool.py	85.71% <0.00%> (-7.94%)	⬇️
napari/_qt/dialogs/qt_package_installer.py	81.81% <0.00%> (+0.39%)	⬆️
napari/utils/theme.py	94.04% <0.00%> (+0.59%)	⬆️
napari/utils/info.py	85.10% <0.00%> (+1.06%)	⬆️
napari/_qt/__init__.py	56.66% <0.00%> (+6.66%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[brisvag]

Minreq failure is unrelated, but maybe this PR could also affect that... maybe we shoudl wait? @Czaki any progress on the minreq issue?

[Czaki]

I have created #5560.
I do not like it, but I do not think that I will be able to ship something better in short time.

My attempt for better solution is here but require time to polish https://github.com/Czaki/tox-min-req

[brisvag]

Tests are good now, let's merge!