Update boostbook from master

cppal-commitbot · cppal-commitbot · commit c67ba01a1391 · 2024-12-27T13:24:37.000Z
diff --git a/tools/boostbook b/tools/boostbook
@@ -1 +1 @@
-Subproject commit 50db69f7e518bdb3c84ba815802c8c684827a9c4
+Subproject commit 066f3561e6166dcaab2f5c1439d41ac105d8361a
