CI: silence numpy-dev failures
xref #31992
ok. this is starting to look promising.

not marking the issue as closed since only silencing here (hence using xfails instead of skips). so fixing the issue is outstanding.

 was not able to reproduce the failures locally so didn't attempt to fix.

will flag as 1.0.2 and backport in order to keep CI there green too. @jreback ping green i'll merge in about 10mins if no objections. can always revert or follow-on if issues. looks like these tests are flakey. will need to skip instead if xfail. xfail is ok but add strict=False

much better than skips > xfail is ok but add strict=False
> 
> much better than skips

sounds good.