cabal-validate: Reorder cli-tests

The `cli-tests` are supposed to be ordered so that the quickest ones run
first. This is not the case, at least on my machine!

cabal-validate/src/Main.hs

@@ -325,15 +325,17 @@ libSuiteExtras opts = forM_ (extraCompilers opts) $ \compiler' ->
 cliTests :: Opts -> IO ()
 cliTests opts = do
   -- These are sorted in asc time used, quicker tests first.
+
+  -- Only single job, otherwise we fail with "Heap exhausted"
   timedCabalBin
     opts
     "cabal-install"
-    "test:long-tests"
-    ( jobsArgs opts
+    "test:mem-use-tests"
+    ( ["--num-threads", "1"]
         ++ tastyArgs opts
     )
 
-  -- This doesn't work in parallel either.
+  -- This test-suite doesn't like concurrency
   timedCabalBin
     opts
     "cabal-install"
@@ -342,16 +344,15 @@ cliTests opts = do
         ++ tastyArgs opts
     )
 
-  -- Only single job, otherwise we fail with "Heap exhausted"
   timedCabalBin
     opts
     "cabal-install"
-    "test:mem-use-tests"
-    ( ["--num-threads", "1"]
+    "test:long-tests"
+    ( jobsArgs opts
         ++ tastyArgs opts
     )
 
-  -- This test-suite doesn't like concurrency
+  -- This doesn't work in parallel either.
   timedCabalBin
     opts
     "cabal-install"