Increase codecov requirements

[bdraco]

A lot more coverage has been added so we can bump this up a bit more.

closes #41

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.31%. Comparing base (416a3b2) to head (315cbeb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   88.27%   88.31%   +0.03%     
==========================================
  Files          17       17              
  Lines         691      693       +2     
  Branches       67       98      +31     
==========================================
+ Hits          610      612       +2     
  Misses         63       63              
  Partials       18       18              

Flag	Coverage Δ
CI-GHA	88.31% <ø> (+0.03%)	⬆️
MyPy	77.98% <ø> (+5.66%)	⬆️
OS-Linux	98.38% <ø> (+0.01%)	⬆️
OS-Windows	93.65% <ø> (+0.04%)	⬆️
OS-macOS	94.17% <ø> (+0.03%)	⬆️
Py-3.10.11	92.88% <ø> (+0.04%)	⬆️
Py-3.10.15	95.46% <ø> (+0.02%)	⬆️
Py-3.11.10	95.46% <ø> (+0.02%)	⬆️
Py-3.11.9	92.88% <ø> (+0.04%)	⬆️
Py-3.12.6	95.46% <ø> (+0.02%)	⬆️
Py-3.13.0-rc.3	95.46% <ø> (+0.02%)	⬆️
Py-3.8.10	93.18% <ø> (+0.04%)	⬆️
Py-3.8.18	95.77% <ø> (+0.02%)	⬆️
Py-3.9.13	92.85% <ø> (+0.04%)	⬆️
Py-3.9.20	95.45% <ø> (+0.02%)	⬆️
Py-pypy7.3.11	95.50% <ø> (+0.03%)	⬆️
Py-pypy7.3.16	95.13% <ø> (+0.03%)	⬆️
Py-pypy7.3.17	95.14% <ø> (+0.03%)	⬆️
VM-macos-latest	94.17% <ø> (+0.03%)	⬆️
VM-ubuntu-latest	98.38% <ø> (+0.01%)	⬆️
VM-windows-latest	93.65% <ø> (+0.04%)	⬆️
pytest	98.38% <ø> (+0.01%)	⬆️

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