CI: use pyarrow 0.17.1 instead of 0.17.0 for py37_macos build
Closes #41937
thanks merge when green (note we may need for 1.2.5 as well?)

cc @simonjayhawkins  > note we may need for 1.2.5 as well?

will know for sure when I do the manual backport of #41924

or could backport anyway? > @simonjayhawkins I think 1.2.5 is still on pyarrow 0.15 so shouldn't backport?

we don't really want ci constantly failing. if we need a patch for pandas 1.2.x to work with pyarrow 0.15 that's a different issue. Sorry, should've been more clear.
The MacOS Python 3.7 job on Azure is on pyarrow 0.15.1 on 1.2.x.
https://github.com/pandas-dev/pandas/blob/322d54a9257e0d57a13dae6a443855df39e18ba3/ci/deps/azure-macos-37.yaml#L24
According to the JIRA issue, it seems this would only affect 0.17.0. I guess we should just first not backport, and then backport if CI is red on the MacOS job then. > According to the JIRA issue, it seems this would only affect 0.17.0. I guess we should just first not backport, and then backport if CI is red on the MacOS job then.

sgtm thanks @jorisvandenbossche 