refactor: use_pandas=False in mf6 sim/pkgs until regressions fixed

[wpbonelli]

• avoid test failures with use_pandas=True
  • mf6: test_gwf_disu.py, test_gwf_errors.py::test_disu_errors
  • flopy: test_binaryfile.py::test_read_mf6_2sp
• regenerate mf6 pkg classes from mf6 develop
• run formatter in notebooks/autotests
• supersedes fix: regenerate classes from mf6 develop #1978

[codecov]

Codecov Report

Merging #1979 (061d4b8) into develop (1eddf86) will decrease coverage by 1.0%.
Report is 1 commits behind head on develop.
The diff coverage is 23.4%.

@@            Coverage Diff            @@
##           develop   #1979     +/-   ##
=========================================
- Coverage     72.7%   71.8%   -1.0%     
=========================================
  Files          257     258      +1     
  Lines        57809   58808    +999     
=========================================
+ Hits         42074   42241    +167     
- Misses       15735   16567    +832     

Files	Coverage Δ
flopy/mf6/data/mfdata.py	75.8% <100.0%> (+0.1%)	⬆️
flopy/mf6/data/mfdataarray.py	60.9% <ø> (-0.1%)	⬇️
flopy/mf6/data/mfdatalist.py	71.0% <100.0%> (-0.4%)	⬇️
flopy/mf6/data/mfdatascalar.py	60.5% <ø> (-0.2%)	⬇️
flopy/mf6/mfsimbase.py	67.5% <100.0%> (+<0.1%)	⬆️
flopy/mf6/modflow/mfgwfchd.py	100.0% <100.0%> (ø)
flopy/mf6/modflow/mfgwfdrn.py	100.0% <100.0%> (ø)
flopy/mf6/modflow/mfgwfevt.py	100.0% <ø> (ø)
flopy/mf6/modflow/mfgwfevta.py	100.0% <100.0%> (ø)
flopy/mf6/modflow/mfgwfghb.py	100.0% <ø> (ø)
... and 17 more

[wpbonelli]

not needed after #1980