Add aiofiles to requirements for improved file handling in tests

Author: oldrev

tests/requirements.txt

@@ -4,4 +4,5 @@ pytest-timeout==2.4.0
 pytest-it==0.1.5
 pytest-json-report==1.5.0
 colorama==0.4.6
-tomlkit==0.13.3
+tomlkit==0.13.3
+aiofiles==25.1.0