(fix) Added restriction in setup.py to require Python >= 3.9 (the new safe-pysha3 does not work with Python <=3.8)

Author: abel

setup.py

@@ -16,7 +16,7 @@
 URL = "https://github.com/InjectiveLabs/sdk-python"
 EMAIL = "[email protected]"
 AUTHOR = "Injective Labs"
-REQUIRES_PYTHON = ">=3.7, <3.11"
+REQUIRES_PYTHON = ">=3.9"
 VERSION = "0.7"
 
 REQUIRED = [