build: update LibVNCServer submodule

bk138 · bk138 · commit d7afcb7ec10d · 2026-02-15T21:34:43.000+01:00
Fixes asking user multiple times for cert accept when IPv6 addresses
are used.
diff --git a/libvncserver b/libvncserver
@@ -1 +1 @@
-Subproject commit fed96b5fd0d0b5d0fc7bc68da3f39df7c3c3de2f
+Subproject commit 56e08b6bdc114dffee0f520f1f66e24357a2980b
