icons: Update to Font Awesome 6.4.2

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

diff --git a/src/font-awesome b/src/font-awesome
index 0698449d50f2b95517562295a59d414afc68b369..f0c25837a3fe0e03783b939559e088abcbfb3c4b 160000 (submodule)
--- a/src/font-awesome
+++ b/src/font-awesome
@@ -1 +1 @@
-Subproject commit 0698449d50f2b95517562295a59d414afc68b369
+Subproject commit f0c25837a3fe0e03783b939559e088abcbfb3c4b