Bump cache version

Author: misode

packages/core/src/service/CacheService.ts

@@ -11,7 +11,7 @@ import type { Project } from './Project.js'
  * The format version of the cache. Should be increased when any changes that
  * could invalidate the cache are introduced to the Spyglass codebase.
  */
-export const LatestCacheVersion = 5
+export const LatestCacheVersion = 6
 
 /**
  * Checksums of cached files or roots.