Update variant2 from master

cppal-commitbot · cppal-commitbot · commit a84454af2e2c · 2024-12-12T16:25:52.000Z
diff --git a/libs/variant2 b/libs/variant2
@@ -1 +1 @@
-Subproject commit a4b167b7238781d75df5d6684c9e9d40b26456dc
+Subproject commit 19b75fffe4a74e9f928f05f5f07920806c93ed7f
