chore(deps): update psutil requirement from <7,>=6.0.0 to >=6.0.0,<8 (#1661)

Author: dependabot[bot]

requirements/testing.txt

@@ -11,7 +11,7 @@ flake8>=5.0.4,<8
 black>=22.8.0; python_version=="3.6"
 black==22.10.0; python_version>"3.6"
 click==8.0.4  # black is affected by https://github.com/pallets/click/issues/2225
-psutil>=6.0.0,<7
+psutil>=6.0.0,<8
 #  used only under slack_sdk/*_store
 boto3<=2
 # For AWS tests