Revert "unpin dulcificum"

This reverts commit ba9e122f6add419824e6fc03d55df40766d4e71d.

conanfile.py

@@ -324,7 +324,7 @@ class CuraConan(ConanFile):
         self.requires("curaengine_grpc_definitions/0.1.0")
         self.requires("zlib/1.2.13")
         self.requires("pyarcus/5.3.0")
-        self.requires("dulcificum/(latest)@ultimaker/testing")
+        self.requires("dulcificum/0.1.0-beta.1")
         self.requires("curaengine/(latest)@ultimaker/testing")
         self.requires("pysavitar/5.3.0")
         self.requires("pynest2d/5.3.0")