Python requirements need to be updated for latest Slicer python version

[jamesobutler]

Slicer recently upgraded from Python 3.6.7 to Python 3.9.10 in Slicer/Slicer@34e48e8. There are now observed build errors of the MFSDA Slicer extension as seen at https://slicer.cdash.org/viewBuildError.php?buildid=2581568. This is because the python requirements file in the repo is including hashes that are only for Python 3.6 wheels. These need to be updated for Python 3.9 wheels which also means the actual version of packages here will need to be updated as some older versions simply don't have Python 3.9 wheels because that version was released before Python 3.9 was even released.

MFSDA_Python/SuperBuild/External_python-MFSDA-requirements.cmake

Lines 43 to 67 in d7e439f

	file(WRITE ${requirements_file} [===[
	# Hashes correspond to the following packages:
	# - python_dateutil-2.8.1-py2.py3-none-any.whl
	python-dateutil==2.8.1 --hash=sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a
	# Hashes correspond to the following packages:
	# - pytz-2020.1-py2.py3-none-any.whl
	pytz==2020.1 --hash=sha256:a494d53b6d39c3c6e44c3bec237336e14305e4f29bbf800b599253057fbb79ed
	# Hashes correspond to the following packages:
	# - pandas-1.0.5-cp36-cp36m-win_amd64.whl
	# - pandas-1.0.5-cp36-cp36m-macosx_10_9_x86_64.whl
	# - pandas-1.0.5-cp36-cp36m-manylinux1_x86_64.whl
	pandas==1.0.5 --hash=sha256:35b670b0abcfed7cad76f2834041dcf7ae47fd9b22b63622d67cdc933d79f453 \
	--hash=sha256:faa42a78d1350b02a7d2f0dbe3c80791cf785663d6997891549d0f86dc49125e \
	--hash=sha256:8778a5cc5a8437a561e3276b85367412e10ae9fff07db1eed986e427d9a674f8
	# Hashes correspond to the following packages:
	# - patsy-0.5.1-py2.py3-none-any.whl
	patsy==0.5.1 --hash=sha256:5465be1c0e670c3a965355ec09e9a502bf2c4cbe4875e8528b0221190a8a5d40
	# Hashes correspond to the following packages:
	# - statsmodels-0.11.1-cp36-none-win_amd64.whl
	# - statsmodels-0.11.1-cp36-cp36m-macosx_10_13_x86_64.whl
	# - statsmodels-0.11.1-cp36-cp36m-manylinux1_x86_64.whl
	statsmodels==0.11.1 --hash=sha256:49aa8ffbe0b0e2e86afa58dec6bd5c483898e9b8223d8a7d13b69b5ad144b674 \
	--hash=sha256:5e7afc596164c1c7464ba3943721a9668aa0ce07853ce9881ac49d3a043784dd \
	--hash=sha256:9efd2e27c08077330cecdbfb589cf84d735abface94e9a6387282a6a7c91362d
	]===])