fix: inaccurate Server-Timing durations

The transaction duration was notably off, doing:

```
curl localhost:3000/rpc/sleep?seconds=5 -i
```

Shows `46.1` for the `transaction;dur`, with this fix we obtain
`5007.3`.

Fixes https://github.com/PostgREST/postgrest/issues/4522

This also fixes inaccurate "schema cache queried" logs,
see https://github.com/PostgREST/postgrest/issues/4551.

(cherry picked from commit 013f078bc4)

src/PostgREST/Auth.hs

@@ -25,8 +25,8 @@ import qualified Network.Wai                     as Wai
 import qualified Network.Wai.Middleware.HttpAuth as Wai
 
 import Data.List        (lookup)
+import PostgREST.TimeIt (timeItT)
 import System.IO.Unsafe (unsafePerformIO)
-import System.TimeIt    (timeItT)
 
 import PostgREST.AppState      (AppState, getConfig, getJwtCacheState,
                                 getTime)