Bump pubspecs to unblock Dart SDK roller (flutter#40297)

Bump pubspecs to unblock Dart SDK roller

Author: goderbauer

lib/web_ui/pubspec.yaml

@@ -3,7 +3,7 @@ publish_to: none
 
 # Keep the SDK version range in sync with pubspecs under web_sdk
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
   js: 0.6.4

tools/path_ops/dart/pubspec.yaml

@@ -8,7 +8,7 @@ publish_to: none
 homepage: https://github.com/flutter/engine/tree/main/tools/path_ops
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dev_dependencies:
   litetest: any

web_sdk/pubspec.yaml

@@ -2,7 +2,7 @@ name: web_sdk_tests
 
 # Keep the SDK version range in sync with lib/web_ui/pubspec.yaml
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
   args: 2.3.1