deps: Upgrade Flutter to latest main, 3.16.0-11.0.pre.88

And update Flutter's supporting libraries to match.

pubspec.lock

@@ -569,18 +569,18 @@ packages:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.0"
+    version: "0.8.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
+      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
       url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.11.0"
   mime:
     dependency: transitive
     description:
@@ -1022,10 +1022,10 @@ packages:
     dependency: transitive
     description:
       name: web
-      sha256: ccbbfbf29732ee1b391c4c6d13e7032d851f675f47365e81904e4c6fd669c854
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
       url: "https://pub.dev"
     source: hosted
-    version: "0.2.2-beta"
+    version: "0.3.0"
   web_socket_channel:
     dependency: transitive
     description:
@@ -1075,5 +1075,5 @@ packages:
     source: hosted
     version: "3.1.2"
 sdks:
-  dart: ">=3.2.0-231.0.dev <4.0.0"
-  flutter: ">=3.16.0-6.0.pre.14"
+  dart: ">=3.3.0-28.0.dev <4.0.0"
+  flutter: ">=3.16.0-11.0.pre.88"

pubspec.yaml

@@ -24,8 +24,8 @@ environment:
   # that by the time we want to release, these will have become stable.
   # TODO: Before general release, switch to stable Flutter and Dart versions,
   #   or pin exact versions: https://github.com/zulip/zulip-flutter/issues/15
-  sdk: '>=3.2.0-231.0.dev <4.0.0'
-  flutter: '>=3.16.0-6.0.pre.14'
+  sdk: '>=3.3.0-28.0.dev <4.0.0'
+  flutter: '>=3.16.0-11.0.pre.88'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions