[BUG] mypi typecheck error

[lmeyerov]

Describe the bug

ci on py3.9 on main:

+ mypy --version
mypy 0.[9](https://github.com/graphistry/pygraphistry/actions/runs/3185568420/jobs/5195293562#step:7:10)82 (compiled: yes)
+ mypy --config-file mypy.ini graphistry
graphistry/util.py:62: error: Argument 1 to "sha256" has incompatible type "Union[ExtensionArray, ndarray[Any, Any]]"; expected "Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData]]"
Found 1 error in 1 file (checked 58 source files)
Error: Process completed with exit code 1.

To Reproduce

Likely via local docker tests as well (docker $ ./test-cpu-local-minimal.sh)`), maybe setting the python version to 3.9

Expected behavior Typechecks

Actual behavior Didn't

Screenshots

Browser environment (please complete the following information):

Graphistry GPU server environment

PyGraphistry API client environment

test-core-python / 3.9 in

https://github.com/graphistry/pygraphistry/actions/runs/3185568420/jobs/5195293562

Additional context

Unclear if fp (suppression) or something around pandas upstream needing a real fix