deps: Upgrade Flutter to 3.26.0-1.0.pre.155

To ensure `isSameColorSwatchAs` is present; we'll use that in an
upcoming commit. From flutter/flutter#155272.

Author: chrisbobbe

pubspec.lock

@@ -1360,5 +1360,5 @@ packages:
     source: path
     version: "0.0.1"
 sdks:
-  dart: ">=3.6.0-217.0.dev <4.0.0"
-  flutter: ">=3.25.0-1.0.pre.296"
+  dart: ">=3.6.0-263.0.dev <4.0.0"
+  flutter: ">=3.26.0-1.0.pre.155"

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: '>=3.6.0-217.0.dev <4.0.0'
-  flutter: '>=3.25.0-1.0.pre.296'
+  sdk: '>=3.6.0-263.0.dev <4.0.0'
+  flutter: '>=3.26.0-1.0.pre.155'
 
 # To update dependencies, see instructions in README.md.
 dependencies: