build(deps-dev): Bump pytest from 5.1.1 to 5.1.2 in /bot (#138)

Bump [pytest](https://github.com/pytest-dev/pytest) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.1.1...5.1.2)

Author: dependabot-preview[bot]

bot/requirements-dev.txt

@@ -1,5 +1,5 @@
 jsonschema==3.0.2
 json-e==3.0.0
 pre-commit==1.18.3
-pytest==5.1.1
+pytest==5.1.2
 responses==0.10.6