web: update dependencies

fix chart tests with latest SDK

web/charts/flutter/pubspec.lock

@@ -1,5 +1,5 @@
 # Generated by pub
-# See https://www.dartlang.org/tools/pub/glossary#lockfile
+# See https://dart.dev/tools/pub/glossary#lockfile
 packages:
   analyzer:
     dependency: transitive
@@ -76,7 +76,7 @@ packages:
     description:
       path: "packages/flutter_web"
       ref: HEAD
-      resolved-ref: "69acfd97c5a7bf0605e9a01df7749716ceb1707f"
+      resolved-ref: "7f588d1f2741f069e19647703d7eb6dd4ff0f464"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -85,7 +85,7 @@ packages:
     description:
       path: "packages/flutter_web_test"
       ref: HEAD
-      resolved-ref: "69acfd97c5a7bf0605e9a01df7749716ceb1707f"
+      resolved-ref: "7f588d1f2741f069e19647703d7eb6dd4ff0f464"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -94,7 +94,7 @@ packages:
     description:
       path: "packages/flutter_web_ui"
       ref: HEAD
-      resolved-ref: "69acfd97c5a7bf0605e9a01df7749716ceb1707f"
+      resolved-ref: "7f588d1f2741f069e19647703d7eb6dd4ff0f464"
       url: "https://github.com/flutter/flutter_web"
     source: git
     version: "0.0.0"
@@ -132,7 +132,7 @@ packages:
       name: http_multi_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.6"
+    version: "2.1.0"
   http_parser:
     dependency: transitive
     description: