Test with GHC 8.4.3 instead of 8.4.2.

Author: svenpanne

OpenGLRaw.cabal

@@ -32,7 +32,7 @@ tested-with:
   GHC == 7.10.3
   GHC == 8.0.2
   GHC == 8.2.2
-  GHC == 8.4.2
+  GHC == 8.4.3
   GHC == 8.5.*
 cabal-version: >= 1.10
 extra-source-files: