update falcon dependency

Author: WilliamBergamin

requirements/adapter.txt

@@ -7,8 +7,8 @@ chalice>=1.28,<2;
 cheroot<12
 CherryPy>=18,<19
 Django>=3,<6
-falcon>=4.2.0,<5; python_version<"3.11"
-falcon>=3.1.1,<5; python_version>="3.11"
+falcon>=2,<4; python_version<"3.9"
+falcon>=4.2.0,<5; python_version>="3.9"
 fastapi>=0.70.0,<1
 Flask>=1,<4
 Werkzeug>=2,<3; python_version<"3.9"