Update DevTools to 2.11.0 and fix update.sh script

Change-Id: I73b4895f6ea16e661f0a54caec01b77dcbfffcb2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/233444
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Kenzie Davisson <kenzieschmoll@google.com>

.dart_tool/package_config.json

@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2022-02-16T17:23:35.575981",
+  "generated": "2022-02-17T08:48:00.006717",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -276,12 +276,6 @@
       "packageUri": "lib/",
       "languageVersion": "2.15"
     },
-    {
-      "name": "devtools_server",
-      "rootUri": "../third_party/devtools/devtools_server",
-      "packageUri": "lib/",
-      "languageVersion": "2.12"
-    },
     {
       "name": "devtools_shared",
       "rootUri": "../third_party/devtools/devtools_shared",