build(deps): bump py from 1.7.0 to 1.10.0 in /core

Bumps [py](https://github.com/pytest-dev/py) from 1.7.0 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@1.7.0...1.10.0)

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

Author: dependabot[bot]

core/requirements.txt

@@ -75,7 +75,7 @@ prompt-toolkit==2.0.9
 protobuf==3.6.1
 psycopg2-binary==2.7.6.1
 ptyprocess==0.6.0
-py==1.7.0
+py==1.10.0
 pycodestyle==2.5.0
 pyflakes==2.1.1
 Pygments==2.4.2