update Nim toolchain recipe

The current upstream development version has improved asyndispatch
performance for Genode.

Fix #2599

repos/libports/ports/nim.hash

@@ -1 +1 @@
-11b0318a9b77aacfb46ec52a5d4df36bce2fd954
+4a41139874bbb2040edacd4b4243526024a5d8d2

repos/libports/ports/nim.port

@@ -4,8 +4,8 @@ DOWNLOADS := nim.archive
 
 OWNER := ehmry
 REPO  := nim
-REV := c129528e8eff8ec8b84664d0b64e8ca89745df2a
+REV := 72df699c3eecf7fa1cf94c02fa460e70d5569ff4
 
 URL(nim) := https://github.com/$(OWNER)/$(REPO)/archive/$(REV).tar.gz
-SHA(nim) := 5350686dfb42a871f6bdbbd634e30b68b39b9d46
+SHA(nim) := 224dabf62a3355c305b9d81682b6cead218cc2d8
 DIR(nim) := .