Minor sample index cleanup (#1532)

web/samples_index/pubspec.yaml

@@ -1,13 +1,15 @@
 name: samples_index
 description: A visual index of Flutter samples
-homepage: https://github.com/flutter/samples_index
+homepage: https://github.com/flutter/samples/tree/main/web/samples_index
 version: 0.0.1
+
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: '>=2.17.0 <3.0.0'
+
 dependencies:
-  json_annotation: ^4.0.1
-  path: ^1.6.0
-  yaml: ^3.0.0
+  json_annotation: ^4.7.0
+  path: ^1.8.0
+  yaml: ^3.1.0
   mdc_web: ^0.6.0
   # ^2.1.5 is no longer compatible with our overridden sass version
   # https://github.com/flutter/samples/issues/1472
@@ -15,15 +17,17 @@ dependencies:
   checked_yaml: ^2.0.1
   webdriver: ^3.0.0
   html: ^0.15.0
+
 dev_dependencies:
   grinder: ^0.9.0
   flutter_lints: ^2.0.1
-  test: ^1.17.10
-  json_serializable: ^6.1.5
-  build: ^2.0.3
-  build_runner: ^2.0.6
-  build_web_compilers: ^3.0.0
-  image: ^3.0.2
+  test: ^1.12.0
+  json_serializable: ^6.5.0
+  build: ^2.3.0
+  build_runner: ^2.3.0
+  build_web_compilers: ^3.2.0
+  image: ^3.2.0
+
 # waiting for the next material-components-web release.
 # Once released, it will need to be rolled into package:mdc_web.
 #