Add stacklevel to all pyresample warnings

[djhoese]

This resolves pre-commit flake8 warnings.

• [ ] Closes #xxxx
• [ ] Tests added
• [ ] Tests passed
• [ ] Passes git diff origin/main **/*py | flake8 --diff
• [ ] Fully documented

[djhoese]

As discussed on slack, I relaxed the thresholds on the failing geocentric_resolution test comparisons to workaround some changes in PROJ. As far as I can tell this PROJ PR is the one that changed things in version 9.1.1 (I know it says 9.2.0, but it is 9.1.1):

https://github.com/OSGeo/PROJ/pull/3361

[codecov[bot]]

Codecov Report

Merging #502 (69feb31) into main (6ff3568) will decrease coverage by 0.34%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #502      +/-   ##
==========================================
- Coverage   94.27%   93.93%   -0.34%     
==========================================
  Files          78       78              
  Lines       12838    12838              
==========================================
- Hits        12103    12060      -43     
- Misses        735      778      +43     

Flag	Coverage Δ
unittests	93.93% <50.00%> (-0.34%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/area_config.py	90.44% <ø> (ø)
pyresample/bilinear/__init__.py	50.00% <0.00%> (ø)
pyresample/bilinear/_base.py	95.80% <ø> (ø)
pyresample/bilinear/_numpy_resampler.py	94.11% <0.00%> (ø)
pyresample/bilinear/xarr.py	92.90% <0.00%> (ø)
pyresample/boundary.py	95.58% <ø> (ø)
pyresample/future/resamplers/nearest.py	92.27% <ø> (ø)
pyresample/future/resamplers/registry.py	85.36% <0.00%> (ø)
pyresample/image.py	85.00% <ø> (ø)
pyresample/kd_tree.py	92.02% <ø> (ø)
... and 7 more

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[coveralls]

Coverage: 93.795%. Remained the same when pulling 69feb3151899adbe6ae3ae3c47f1de6f0f60bea5 on djhoese:bugfix-warning-stacklevel into 6ff356827093d9430e59dbe741bd6201f30bd799 on pytroll:main.