Use testing for dependencies on main

Otherwise, we will use the same dependencies for 5.5.0-beta. Such as CuraEngine and fdm_materials etc.

conanfile.py

@@ -308,18 +308,18 @@ def requirements(self):
         self.requires("curaengine_grpc_definitions/latest@ultimaker/testing")
         self.requires("zlib/1.2.13")
         self.requires("pyarcus/5.3.0")
-        self.requires("curaengine/(latest)@ultimaker/stable")
+        self.requires("curaengine/(latest)@ultimaker/testing")
         self.requires("pysavitar/5.3.0")
         self.requires("pynest2d/5.3.0")
         self.requires("curaengine_plugin_gradual_flow/(latest)@ultimaker/testing")
-        self.requires("uranium/(latest)@ultimaker/stable")
-        self.requires("cura_binary_data/(latest)@ultimaker/stable")
+        self.requires("uranium/(latest)@ultimaker/testing")
+        self.requires("cura_binary_data/(latest)@ultimaker/testing")
         self.requires("cpython/3.10.4")
         if self.options.internal:
             self.requires("cura_private_data/(latest)@ultimaker/testing")
             self.requires("fdm_materials/(latest)@internal/testing")
         else:
-            self.requires("fdm_materials/(latest)@ultimaker/stable")
+            self.requires("fdm_materials/(latest)@ultimaker/testing")
 
     def build_requirements(self):
         if self.options.devtools: