Update spirit from develop

boost-commitbot · boost-commitbot · commit be93c0c65698 · 2025-05-09T10:05:04.000Z
diff --git a/libs/spirit b/libs/spirit
@@ -1 +1 @@
-Subproject commit ba53544ac90778a7f2774c21fb552572bf7b37bd
+Subproject commit 8fac21bea321923d13b32bdcd29c56911bff0e0b
