servo: Merge #13537 - Ensure cargo is up to date before running update crate command (from GuillaumeGomez:mach_update); r=Wafflespeanut

Fixes #13526

Source-Repo: https://github.com/servo/servo
Source-Revision: 45cc847a005e1722b888ba2ea20f4ab80b70af9f

servo/python/servo/devenv_commands.py

@@ -87,6 +87,8 @@ class MachCommands(CommandBase):
             print("flag or update all packages with --all-packages (-a) flag")
             sys.exit(1)
 
+        self.ensure_bootstrapped()
+
         for cargo_path in CARGO_PATHS:
             with cd(cargo_path):
                 print(cargo_path)