Bump pytest from 5.4.1 to 5.4.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.1 to 5.4.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.1...5.4.2)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -2,5 +2,5 @@ attrs==19.3.0
 grpcio==1.28.1
 grpcio-tools==1.28.1
 protobuf==3.11.3
-pytest==5.4.1
+pytest==5.4.2
 six==1.14.0

shoppingcart/requirements.txt

@@ -2,5 +2,5 @@ attrs==19.3.0
 grpcio==1.28.1
 grpcio-tools==1.28.1
 protobuf==3.11.3
-pytest==5.4.1
+pytest==5.4.2
 six==1.14.0