Raise the file dependency max to v8.0.0

Author: batch-changes-for-github[bot]

pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   source_span: ^1.8.1
   yaml: ^3.1.0
   yaml_edit: ^2.0.0
-  file: ^6.1.2
+  file: '>=6.1.2 <8.0.0'
   io: ^1.0.0
   w_transport: ^5.2.1