Clean up unused imports in refactored analyzers

Co-authored-by: jackfirth <[email protected]>

Author: Copilot

default-recommendations/analyzers/identifier-usage.rkt

@@ -9,13 +9,9 @@
   [identifier-usage-analyzer expansion-analyzer?]))
 
 
-(require racket/hash
-         racket/list
-         racket/set
+(require racket/list
          racket/stream
-         racket/treelist
          rebellion/collection/entry
-         rebellion/collection/hash
          rebellion/streaming/transducer
          resyntax/private/analyzer
          resyntax/private/expanded-id-table

default-recommendations/analyzers/variable-mutability.rkt

@@ -9,8 +9,7 @@
   [variable-mutability-analyzer expansion-analyzer?]))
 
 
-(require racket/dict
-         racket/list
+(require racket/list
          racket/match
          racket/stream
          rebellion/collection/entry