add threads-extra to stackage

add clock-extras and next-ref to build-constraints.yaml

build-constraints.yaml

@@ -2504,7 +2504,7 @@ packages:
 
     "Philipp Balzarek <p.balzarek@googlemail.com>":
         - xml-picklers
-        
+
     "Lennart Spitzner lsp@informatik.uni-kiel.de @lspitzner":
         - multistate
         - pqueue
@@ -2514,11 +2514,16 @@ packages:
 
     "Tony Day <tonyday567@gmail.com> @tonyday567":
         - chart-unit
-        
+
     "Iphigenia Df <iphydf@gmail.com> @iphydf":
         - data-msgpack
         - network-msgpack-rpc
 
+    "Jonathan Fischoff <jonathangfischoff@gmail.com>":
+        - threads-extra
+        - clock-extras
+        - next-ref
+
     # If you stop maintaining a package you can move it here.
     # It will then be disabled if it starts causing problems.
     # See https://github.com/fpco/stackage/issues/1056