docs: Update faq.rst with info about poetry version

[abelowska]

On M3 apple silicon the build does not work with poetry>1.1.15 and httpstan==4.11.0. Recent poetry version (1.7.1) require crashtest = "^0.4.1" (see logs from the error below):

poetry 1.7.1 requires crashtest<0.5.0,>=0.4.1, but you have crashtest 0.3.1 which is incompatible.

while pystan has a transitive dependency on crashtest<0.4.0,>=0.3.0 via clikit<0.7,>=0.6.

I managed to get it working with poetry==1.1.15

[riddell-stan]

Would be nice to fix the underlying issue. If poetry is going to fix this issue shortly, we might wait. If not, we should probably change the version of poetry required in httpstan.

Closing this here because it's not really a pystan issue. If you can confirm poetry isn't going to fix this, please open an issue in stan-dev/httpstan