Simplify dependencies for dependabot (#1484)

Author: WilliamBergamin

requirements/optional.txt

@@ -12,6 +12,5 @@ boto3<=2
 SQLAlchemy>=1.4,<3
 # Socket Mode
 # websockets 9 is not compatible with Python 3.10
-websockets>=9.1,<10; python_version=="3.6"
-websockets>=10,<13; python_version>"3.6"
+websockets>=9.1,<13
 websocket-client>=1,<2

requirements/testing.txt

@@ -15,6 +15,4 @@ psutil>=5,<6
 #  used only under slack_sdk/*_store
 boto3<=2
 # For AWS tests
-moto==4.0.13; python_version=="3.6"
-moto<5; python_version=="3.7"
-moto<6
+moto>=4.0.13,<6