:wrench: gitignore doxygen output (util)

diff --git a/util b/util
index 55c0e0b112007b50e6e5afb9736d1b04b5fe0ad4..0227dde4c8e0ff2c80f816833a5e818cd1219b58 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 55c0e0b112007b50e6e5afb9736d1b04b5fe0ad4
+Subproject commit 0227dde4c8e0ff2c80f816833a5e818cd1219b58