build: (deps): bump file_picker from 10.3.10 to 11.0.2

Bumps [file_picker](https://github.com/miguelpruivo/flutter_file_picker) from 10.3.10 to 11.0.2.
- [Release notes](https://github.com/miguelpruivo/flutter_file_picker/releases)
- [Changelog](https://github.com/miguelpruivo/flutter_file_picker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/miguelpruivo/flutter_file_picker/compare/v10.3.10...v11.0.2)

---
updated-dependencies:
- dependency-name: file_picker
  dependency-version: 11.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

lib/utils/file_selector.dart

@@ -13,7 +13,7 @@ Future<List<XFile>> selectFiles(
   final result = await AppLock.of(context).pauseWhile(
     showFutureLoadingDialog(
       context: context,
-      future: () => FilePicker.platform.pickFiles(
+      future: () => FilePicker.pickFiles(
         compressionQuality: 0,
         allowMultiple: allowMultiple,
         type: type,

lib/utils/matrix_sdk_extensions/matrix_file_extension.dart

@@ -9,7 +9,7 @@ extension MatrixFileExtension on MatrixFile {
   Future<void> save(BuildContext context) async {
     final scaffoldMessenger = ScaffoldMessenger.of(context);
     final l10n = L10n.of(context);
-    final downloadPath = await FilePicker.platform.saveFile(
+    final downloadPath = await FilePicker.saveFile(
       dialogTitle: l10n.saveFile,
       fileName: name,
       type: filePickerFileType,