Pin pytest to latest version 6.2.4

pyup-bot · pyup-bot · commit 7e7554c45089 · 2021-08-13T17:35:24.000+10:00
diff --git a/test-requirements.txt b/test-requirements.txt
@@ -1,2 +1,2 @@
-pytest
+pytest==6.2.4
 pytest-cov
