third-party: Update to Font-Awesome 6.4.0

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/src/third-party/Font-Awesome b/src/third-party/Font-Awesome
index b452a2c086a5e3f319df61b1ce1db7d8e1ad2b7c..0698449d50f2b95517562295a59d414afc68b369 160000 (submodule)
--- a/src/third-party/Font-Awesome
+++ b/src/third-party/Font-Awesome
@@ -1 +1 @@
-Subproject commit b452a2c086a5e3f319df61b1ce1db7d8e1ad2b7c
+Subproject commit 0698449d50f2b95517562295a59d414afc68b369