Fix syntax of thrown errors.

done as part of CURA-11622

conanfile.py

@@ -182,11 +182,11 @@ def _generate_pyinstaller_spec(self, location, entrypoint_location, icon_path, e
                     src_path = str(Path(cura_source_folder, data["src"]))
                 else:
                     if data["package"] not in self.dependencies:
-                        raise ConanException(f"Required package {data["package"]} does not exist as a dependency")
+                        raise ConanException(f"Required package {data['package']} does not exist as a dependency")
 
-                    package_folder = self.dependencies[data["package"]].package_folder
+                    package_folder = self.dependencies[data['package']].package_folder
                     if package_folder is None:
-                        raise ConanException(f"Unable to find package_folder for {data["package"]}, check that it has not been skipped")
+                        raise ConanException(f"Unable to find package_folder for {data['package']}, check that it has not been skipped")
 
                     src_path = os.path.join(self.dependencies[data["package"]].package_folder, data["src"])
             elif "root" in data:  # get the paths relative from the install folder