Bump scssphp/scssphp to 1.8.1

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

diff --git a/3rdparty b/3rdparty
index 1269091e96a2a550912db37c0d2b29ed5c0aa60f..108a384f119a8bdad65210e7231a287f46ede73e 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit 1269091e96a2a550912db37c0d2b29ed5c0aa60f
+Subproject commit 108a384f119a8bdad65210e7231a287f46ede73e