Bump to latest wireguard-go release

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/wireguard-go b/wireguard-go
index a8326ae753975e73602958c1d7bbfe1174912ff9..8fde8334dcf3a7f3934159f45b6fc1d5f4be8a90 160000 (submodule)
--- a/wireguard-go
+++ b/wireguard-go
@@ -1 +1 @@
-Subproject commit a8326ae753975e73602958c1d7bbfe1174912ff9
+Subproject commit 8fde8334dcf3a7f3934159f45b6fc1d5f4be8a90