Update optional from master

boost-commitbot · boost-commitbot · commit e90a0521a382 · 2026-07-15T23:20:37.000Z
diff --git a/libs/optional b/libs/optional
@@ -1 +1 @@
-Subproject commit 8bc4a16933e34c0de04869b587bf8032c2b24b77
+Subproject commit c0648f5f2d7b7d8e59c6e2c1d203f34c7aec129e
