deps: Upgrade Flutter to latest main, 3.12.0-15.0.pre.69

And update Flutter's supporting libraries to match.

Author: gnprice

pubspec.lock

@@ -849,18 +849,18 @@ packages:
     dependency: transitive
     description:
       name: stack_trace
-      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.11.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
   stream_transform:
     dependency: transitive
     description:
@@ -889,26 +889,26 @@ packages:
     dependency: "direct dev"
     description:
       name: test
-      sha256: "13b41f318e2a5751c3169137103b60c584297353d4b1761b66029bae6411fe46"
+      sha256: "67ec5684c7a19b2aba91d2831f3d305a6fd8e1504629c5818f8d64478abf4f38"
       url: "https://pub.dev"
     source: hosted
-    version: "1.24.3"
+    version: "1.24.4"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
+      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.0"
+    version: "0.6.1"
   test_core:
     dependency: transitive
     description:
       name: test_core
-      sha256: "99806e9e6d95c7b059b7a0fc08f07fc53fabe54a829497f0d9676299f1e8637e"
+      sha256: "6b753899253c38ca0523bb0eccff3934ec83d011705dae717c61ecf209e333c9"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.3"
+    version: "0.5.4"
   timing:
     dependency: transitive
     description:
@@ -1078,5 +1078,5 @@ packages:
     source: hosted
     version: "3.1.2"
 sdks:
-  dart: ">=3.1.0-236.0.dev <4.0.0"
-  flutter: ">=3.12.0-7.0.pre.54"
+  dart: ">=3.1.0-285.0.dev <4.0.0"
+  flutter: ">=3.12.0-15.0.pre.69"

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: '>=3.1.0-236.0.dev <4.0.0'
-  flutter: '>=3.12.0-7.0.pre.54'
+  sdk: '>=3.1.0-285.0.dev <4.0.0'
+  flutter: '>=3.12.0-15.0.pre.69'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions