[bootstrap] add --update-deps in install command

bob/devtools/bootstrap.py

@@ -547,6 +547,7 @@ if __name__ == "__main__":
                   ])
         if conda_cmd == "install":
             cmd.insert(2, "--update-specs")
+            cmd.insert(2, "--update-deps")
         run_cmdline(cmd)
 
     # print conda information for debugging purposes