chore: tighten dependencies (#62)

pubspec.yaml

@@ -6,17 +6,17 @@ issue_tracker: https://github.com/VeryGoodOpenSource/pub_updater/issues
 topics: [cli, pub, version]
 
 environment:
-  sdk: ">=3.0.0 <4.0.0"
+  sdk: ^3.5.0
 
 dependencies:
-  http: ^1.0.0
-  json_annotation: ^4.1.0
-  process: ^5.0.0
-  pub_semver: ^2.1.3
+  http: ^1.2.2
+  json_annotation: ^4.9.0
+  process: ^5.0.2
+  pub_semver: ^2.1.4
 
 dev_dependencies:
-  build_runner: ^2.1.2
-  json_serializable: ^6.5.3
-  mocktail: ^1.0.0
-  test: ^1.17.0
-  very_good_analysis: ">=5.1.0 <7.0.0"
+  build_runner: ^2.4.12
+  json_serializable: ^6.8.0
+  mocktail: ^1.0.4
+  test: ^1.25.8
+  very_good_analysis: ^6.0.0