[file_selector] Relax xdg_directories constraint (#7157)

`xdg_directories` 0.2.0 was update to 1.0 to reflect that it has a
stable API, with no other changes. This updates the constraint to allow
either 0.2.x or 1.x to avoid dependency conflicts in the future.

packages/path_provider/path_provider_linux/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.1.8
 
+* Adds compatibility with `xdg_directories` 1.0.
 * Updates minimum Flutter version to 3.0.
 
 ## 2.1.7

packages/path_provider/path_provider_linux/pubspec.yaml

@@ -2,7 +2,7 @@ name: path_provider_linux
 description: Linux implementation of the path_provider plugin
 repository: https://github.com/flutter/plugins/tree/main/packages/path_provider/path_provider_linux
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+path_provider%22
-version: 2.1.7
+version: 2.1.8
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
@@ -21,7 +21,7 @@ dependencies:
     sdk: flutter
   path: ^1.8.0
   path_provider_platform_interface: ^2.0.0
-  xdg_directories: ^0.2.0
+  xdg_directories: ">=0.2.0 <2.0.0"
 
 dev_dependencies:
   flutter_test: