[path_provider] Allow `win32` up to version 4.x (#3820)

Adds compatibility with version 4.x of `win32`. No breaking changes impacted the plugin, so this just relaxes the constraint.

Fixes https://github.com/flutter/flutter/issues/125355
diff --git a/packages/path_provider/path_provider_windows/CHANGELOG.md b/packages/path_provider/path_provider_windows/CHANGELOG.md
index e40563d..a9218de 100644
--- a/packages/path_provider/path_provider_windows/CHANGELOG.md
+++ b/packages/path_provider/path_provider_windows/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.1.6
+
+* Adds compatibility with `win32` 4.x.
+
 ## 2.1.5
 
 * Clarifies explanation of endorsement in README.
diff --git a/packages/path_provider/path_provider_windows/pubspec.yaml b/packages/path_provider/path_provider_windows/pubspec.yaml
index 077d678..132612c 100644
--- a/packages/path_provider/path_provider_windows/pubspec.yaml
+++ b/packages/path_provider/path_provider_windows/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Windows implementation of the path_provider plugin
 repository: https://github.com/flutter/packages/tree/main/packages/path_provider/path_provider_windows
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+path_provider%22
-version: 2.1.5
+version: 2.1.6
 
 environment:
   sdk: ">=2.17.0 <4.0.0"
@@ -21,7 +21,7 @@
     sdk: flutter
   path: ^1.8.0
   path_provider_platform_interface: ^2.0.0
-  win32: ">=2.1.0 <4.0.0"
+  win32: ">=2.1.0 <5.0.0"
 
 dev_dependencies:
   flutter_test: