[3rdparty] Bump punic to 1.6.3

diff --git a/3rdparty b/3rdparty
index ac2a9ef827f039f1a7cb1e5836723f89ecbea53f..d6fce71b81fd184b143341f509fac1d3d5f60b9e 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit ac2a9ef827f039f1a7cb1e5836723f89ecbea53f
+Subproject commit d6fce71b81fd184b143341f509fac1d3d5f60b9e