Update pytest requirement from <5.3.0 to <5.4.0

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@1.0.0b3...5.3.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

setup.py

@@ -47,6 +47,6 @@
     ],
     zip_safe=True,
     setup_requires=[] + PYTEST_RUNNER,
-    tests_require=["pytest < 5.3.0"],
+    tests_require=["pytest < 5.4.0"],
     test_suite="tests",
 )

test-requirements.txt

@@ -1,3 +1,3 @@
-pytest < 5.3.0
+pytest < 5.4.0
 pytest-runner
 pytest-cov