haskellPackages.hpc-codecov: add wolfgangwalther as maintainer

We're using this for PostgREST, so I don't want this to fail.

pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml

@@ -664,6 +664,7 @@ package-maintainers:
   utdemir:
     - nix-tree
   wolfgangwalther:
+    - hpc-codecov
     - postgres-websockets
     - postgrest
   zowoq:

pkgs/development/haskell-modules/hackage-packages.nix

@@ -350838,6 +350838,7 @@ self: {
       description = "Generate reports from hpc data";
       license = lib.licenses.bsd3;
       mainProgram = "hpc-codecov";
+      maintainers = [ lib.maintainers.wolfgangwalther ];
     }
   ) { };