Log Message:
py-numpy: updated to 1.19.4

1.19.4:
MAINT: Add check for Windows 10 version 2004 bug.
REV: Revert OpenBLAS to 1.19.2 version for 1.19.4

1.19.3:
BLD: set upper versions for build dependencies
BUG: Set deprecated fields to null in PyArray_InitArrFuncs
ENH: Warn on unsupported Python 3.10+
MAINT: Update test_requirements.txt.
ENH: Support for the NVIDIA HPC SDK nvfortran compiler
BUG: Cygwin Workaround for #14787 on affected platforms
BUG: Fix memory leak of buffer-info cache due to relaxed strides
MAINT: Backport openblas_support from master.
TST: Add Python 3.9 to the CI testing on Windows, Mac.
TST: Simplify source path names in test_extending.