Update requirements.txt

Removed hardcoded protobuf==5.29.5 and 
Added protobuf>=6.31.1,<7.0.0 to satisfy grpcio-status==1.74.0 dependency

Author: siddhartha-quad

community/front-end/ofe/requirements.txt

@@ -68,7 +68,7 @@ pkgutil_resolve_name==1.3.10
 platformdirs==4.4.0
 pre-commit==4.3.0
 proto-plus==1.26.1
-protobuf==5.29.5
+protobuf>=6.31.1,<7.0.0
 pyasn1==0.6.1
 pyasn1-modules==0.4.2
 pycparser==2.22