bump up hiedb version (#4640)

Author: soulomoon

ghcide/session-loader/Development/IDE/Session.hs

@@ -223,7 +223,7 @@ instance Pretty Log where
 
 -- | Bump this version number when making changes to the format of the data stored in hiedb
 hiedbDataVersion :: String
-hiedbDataVersion = "1"
+hiedbDataVersion = "2"
 
 data CacheDirs = CacheDirs
   { hiCacheDir, hieCacheDir, oCacheDir :: Maybe FilePath}
@@ -956,6 +956,8 @@ CallStack (from HasCallStack):
   expectJust, called at compiler\\typecheck\\FamInst.hs:461:30 in ghc:FamInst
 ```
 
+and many more.
+
 To mitigate this, we set the cache directory for each component dependent
 on the components of the current `HscEnv`, additionally to the component options
 of the respective components.