deps: Upgrade Flutter to 3.33.0-1.0.pre-1085

And update Flutter's supporting libraries to match.

In particular this gets us TransitionDurationObserver:
  flutter/flutter#171109

We stop just before a certain Dart SDK roll:
  flutter/flutter@fa80cbcbdbdd
because that commit breaks completion in the IDE, which would be
pretty annoying for doing development.  Thanks to Sayed for
spotting that breakage and bisecting it to that commit:
  #1755 (comment)
  https://chat.zulip.org/#narrow/channel/516-mobile-dev-help/topic/New.20Flutter.20upgrade.20degrades.20code.20autocompletion/near/2230721

Author: gnprice

pubspec.lock

@@ -714,10 +714,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   mime:
     dependency: "direct main"
     description:
@@ -1355,5 +1355,5 @@ packages:
     source: path
     version: "0.0.1"
 sdks:
-  dart: ">=3.9.0-293.0.dev <4.0.0"
-  flutter: ">=3.33.0-1.0.pre.832"
+  dart: ">=3.10.0-15.0.dev <4.0.0"
+  flutter: ">=3.33.0-1.0.pre-1085"

pubspec.yaml

@@ -14,8 +14,8 @@ environment:
   # We use a recent version of Flutter from its main channel, and
   # the corresponding recent version of the Dart SDK.
   # Feel free to update these regularly; see README.md for instructions.
-  sdk: '>=3.9.0-293.0.dev <4.0.0'
-  flutter: '>=3.33.0-1.0.pre.832'  # d35bde5363d5e25b71d69a81e8c93b0ee3272609
+  sdk: '>=3.10.0-15.0.dev <4.0.0'
+  flutter: '>=3.33.0-1.0.pre-1085'  # b46957fb06ffbd8590caa8590f1a0b06a71fc609
 
 # To update dependencies, see instructions in README.md.
 dependencies: