Bump py from 1.4.34 to 1.10.0 in /docs

Bumps [py](https://github.com/pytest-dev/py) from 1.4.34 to 1.10.0.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/py@1.4.34...1.10.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -55,7 +55,7 @@ pexpect==4.3.0
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
 ptyprocess==0.5.2
-py==1.4.34
+py==1.10.0
 pycparser==2.18
 Pygments==2.2.0
 pylint==1.7.2