Remove version limit on pytest in CI

[djhoese]

This was added due to pytest-lazy-fixture but the replacement package pytest-lazy-fixtures fixes compatibility.

• Closes #xxxx
• Tests added
• Fully documented

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (42410d3) to head (1880cf4).
Report is 227 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3010      +/-   ##
==========================================
- Coverage   96.10%   96.10%   -0.01%     
==========================================
  Files         377      377              
  Lines       55177    55163      -14     
==========================================
- Hits        53026    53012      -14     
  Misses       2151     2151              

Flag	Coverage Δ
behaviourtests	3.94% <0.00%> (+<0.01%)	⬆️
unittests	96.19% <100.00%> (-0.01%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 12202802932

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.002%) to 96.206%

---

Files with Coverage Reduction	New Missed Lines	%
satpy/tests/test_readers.py	1	99.24%

Totals
Change from base Build 12180733434:	-0.002%
Covered Lines:	53256
Relevant Lines:	55356

---

💛 - Coveralls