Update environment and testing

[wtgee]

• Minimum python bumped to 3.9
• Fix namespace to work with pep 420 and with pyscaffold.
• Uses panoptes-utils>=0.2.35
• Missing pandas dependency
• GHA testing runs on matrix of python versions.
• Fix testing config file.

[codecov[bot]]

Codecov Report

Merging #1157 (44d7f6a) into develop (4908119) will decrease coverage by 0.96%. The diff coverage is 77.97%.

@@             Coverage Diff             @@
##           develop    #1157      +/-   ##
===========================================
- Coverage    83.08%   82.11%   -0.97%     
===========================================
  Files           86       87       +1     
  Lines         7425     7487      +62     
  Branches       635      645      +10     
===========================================
- Hits          6169     6148      -21     
- Misses        1083     1162      +79     
- Partials       173      177       +4     

Impacted Files	Coverage Δ
src/panoptes/pocs/camera/gphoto/base.py	100.00% <ø> (ø)
src/panoptes/pocs/camera/gphoto/remote.py	20.75% <0.00%> (-0.82%)	:arrow_down:
src/panoptes/pocs/mount/mount.py	67.20% <0.00%> (-3.99%)	:arrow_down:
...rc/panoptes/pocs/state/states/default/analyzing.py	41.17% <0.00%> (-18.83%)	:arrow_down:
src/panoptes/pocs/state/states/default/tracking.py	26.66% <0.00%> (-56.67%)	:arrow_down:
src/panoptes/pocs/utils/logger.py	100.00% <ø> (ø)
tests/test_theskyx_utils.py	92.85% <ø> (ø)
src/panoptes/pocs/camera/__init__.py	62.36% <46.15%> (-8.43%)	:arrow_down:
src/panoptes/pocs/camera/camera.py	84.49% <50.00%> (ø)
src/panoptes/pocs/scheduler/__init__.py	93.47% <50.00%> (-6.53%)	:arrow_down:
... and 22 more

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