Update CI setup and remove Python 3.7

[brandonwillard]

This PR updates the CI setup to better reflect Aesara's setup. It also removes explicit support for Python 3.7.

[maresb]

https://github.com/aesara-devs/aemcmc/actions/runs/4088898918/jobs/7051043531#step:6:597

FAILED tests/test_basic.py::test_create_gibbs - ValueError: n too large or p too small, see Generator.negative_binomial Notes
Apply node that caused the error: nbinom_rv{0, (0, 0), int64, True}(RandomGeneratorSharedVariable(<Generator(PCG64) at 0x7FEE1823E340>), TensorConstant{[]}, TensorConstant{4}, h, Elemwise{Composite{sigmoid((-i0))}}[(0, 0)].0)
Toposort index: 72
Inputs types: [RandomGeneratorType, TensorType(int64, (0,)), TensorType(int64, ()), TensorType(float64, ()), TensorType(float64, (?,))]
Inputs shapes: ['No shapes', (0,), (), (), (100,)]
Inputs strides: ['No strides', (0,), (), (), (8,)]
Inputs values: [Generator(PCG64) at 0x7FEE1823E340, array([], dtype=int64), array(4), array(106.86324627), 'not shown']
Outputs clients: [['output'], []]

HINT: Re-running with most Aesara optimizations disabled could provide a back-trace showing when this node was created. This can be done by setting the Aesara flag 'optimizer=fast_compile'. If that does not work, Aesara optimizations can be disabled with 'optimizer=None'.
HINT: Use the Aesara flag `exception_verbosity=high` for a debug print-out and storage map footprint of this Apply node.

[brandonwillard]

FYI: The error is due to #96.

[codecov]

Codecov Report

Base: 98.28% // Head: 98.16% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (e7e4031) compared to base (6979561).
Patch coverage: 95.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   98.28%   98.16%   -0.12%     
==========================================
  Files          10       10              
  Lines         698      708      +10     
  Branches       62       63       +1     
==========================================
+ Hits          686      695       +9     
  Misses          5        5              
- Partials        7        8       +1     

Impacted Files	Coverage Δ
aemcmc/conjugates.py	100.00% <ø> (ø)
aemcmc/ffbs.py	100.00% <ø> (ø)
aemcmc/nuts.py	98.50% <ø> (ø)
aemcmc/transforms.py	100.00% <ø> (ø)
aemcmc/types.py	100.00% <ø> (ø)
aemcmc/rewriting.py	98.07% <90.90%> (-0.60%)	⬇️
aemcmc/basic.py	100.00% <100.00%> (ø)
aemcmc/gibbs.py	95.36% <100.00%> (-0.08%)	⬇️
aemcmc/utils.py	100.00% <100.00%> (ø)

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