Allow analyzer ^7.0.0 dep (#1608)

Author: srawlins

CHANGELOG.md

@@ -163,6 +163,8 @@ are included, some of them breaking:
   intended to be extended or implemented. They are now all marked `final` to
   make that intention explicit.
 
+* Require `package:analyzer` `>=6.5.0 <8.0.0`.
+
 ## 2.3.7
 
 * Allow passing a language version to `DartFomatter()`. Formatted code will be

pubspec.yaml

@@ -9,7 +9,7 @@ environment:
   sdk: "^3.4.0"
 
 dependencies:
-  analyzer: '^6.5.0'
+  analyzer: ">=6.5.0 <8.0.0"
   args: ">=1.0.0 <3.0.0"
   collection: "^1.17.0"
   package_config: ^2.1.0