Use shared curaengine_grpc_definitions

Although not a direct dependency of Cura, still need to define it here,
such that we can set it as shared for all dependencies.
Needed to overcome the issues with glibc and static compiling of the
gradual flow plugin on ubuntu 20.04 with gcc-13

Contributes to CURA-10951

conanfile.py

@@ -296,6 +296,7 @@ def configure(self):
         self.options["pynest2d"].shared = True
         self.options["cpython"].shared = True
         self.options["boost"].header_only = True
+        self.options["curaengine_grpc_definitions"].shared = True
 
     def validate(self):
         version = self.conf_info.get("user.cura:version", default = self.version, check_type = str)
@@ -304,6 +305,7 @@ def validate(self):
 
     def requirements(self):
         self.requires("boost/1.82.0")
+        self.requires("curaengine_grpc_definitions/latest@ultimaker/testing")
         self.requires("pyarcus/(latest)@ultimaker/cura_10951")
         self.requires("curaengine/(latest)@ultimaker/cura_10475")
         self.requires("pysavitar/(latest)@ultimaker/cura_10951")