Tune tolerance to fix test failures with PROJ 9.1.1.

[sebastic]

As reported in #484, test_area_def_geocentric_resolution fails with PROJ 9.1.1 because the tolerance is exceeded.

• Closes Fails to build with Shapely 2.0 #484
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff

[djhoese]

Thanks for the bug report and the quick fix! Glad you figured out what was causing it.

[codecov]

Codecov Report

Merging #485 (0d97737) into main (790c847) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #485   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files          74       74           
  Lines       12890    12890           
=======================================
  Hits        12159    12159           
  Misses        731      731           

Flag	Coverage Δ
unittests	94.32% <100.00%> (ø)

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

Impacted Files	Coverage Δ
pyresample/test/test_geometry.py	99.54% <100.00%> (ø)

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[coveralls]

Coverage remained the same at 93.851% when pulling 0d97737 on sebastic:test_area_def_geocentric_resolution into 790c847 on pytroll:main.