Update index-state to get latest stan version

Fixes: #3885

Author: 0rphee

cabal.project

@@ -35,7 +35,7 @@ packages:
          ./plugins/hls-refactor-plugin
          ./plugins/hls-overloaded-record-dot-plugin
 
-index-state: 2023-11-14T11:26:13Z
+index-state: 2023-12-10T23:30:17Z
 
 tests: True
 test-show-details: direct