Do not restrict pytest dependencies versions (redis#3286)

Try to not restrict the versions of pytest dependencies, see if we can
get rid of the segmentation faults that we see pretty often in the CI.

Take the opportunity to sort the dev_requirements.txt file.

dev_requirements.txt

@@ -1,17 +1,17 @@
-click==8.0.4
 black==22.3.0
-flake8==5.0.4
+click==8.0.4
 flake8-isort==6.0.0
+flake8==5.0.4
 flynt~=0.69.0
+invoke==1.7.3
 mock==4.0.3
 packaging>=20.4
-pytest==7.2.0
-pytest-timeout==2.1.0
-pytest-asyncio>=0.20.2
-invoke==1.7.3
-pytest-cov>=4.0.0
-vulture>=2.3.0
+pytest
+pytest-asyncio
+pytest-cov
+pytest-timeout
 ujson>=4.2.0
-wheel>=0.30.0
 urllib3<2
 uvloop
+vulture>=2.3.0
+wheel>=0.30.0