CI: Supress moto server logs in tests
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

https://github.com/pandas-dev/pandas/pull/38096 originally did not do the trick. This change worked for me locally.
cool ping on green (let's verify that it does the trick as well :->) thanks @mroeschke  @meeseeksdev backport 1.2.x Something went wrong ... Please have  a look at my logs.