Please find below an update for graphics/coin to version 4.0.6.

Tested consumers:
cad/freecad
graphics/py-pivy

Index: Makefile
===================================================================
RCS file: /cvs/ports/graphics/coin/Makefile,v
diff -u -p -r1.4 Makefile
--- Makefile	21 Jul 2025 20:42:47 -0000	1.4
+++ Makefile	19 Oct 2025 09:30:22 -0000
@@ -1,12 +1,12 @@
 COMMENT =		3D graphics library based on the Open Inventor API
 
-V = 			4.0.4
+V = 			4.0.6
 DISTNAME =		coin-${V}-src
 PKGNAME =		${DISTNAME:S/-src$//}
 
 SITES =			https://github.com/coin3d/coin/releases/download/v${V}/
 
-SHARED_LIBS +=  	Coin	0.1 # 0.0
+SHARED_LIBS +=  	Coin	0.2 # 0.0
 
 CATEGORIES =		graphics
 HOMEPAGE =		https://www.coin3d.org/
Index: distinfo
===================================================================
RCS file: /cvs/ports/graphics/coin/distinfo,v
diff -u -p -r1.3 distinfo
--- distinfo	21 Jul 2025 20:42:47 -0000	1.3
+++ distinfo	19 Oct 2025 09:30:22 -0000
@@ -1,2 +1,2 @@
-SHA256 (coin-4.0.4-src.tar.gz) = gO/QVqRFBQk5omXbMH0QasdSQQV3TUvpJKcbDP8jpxk=
-SIZE (coin-4.0.4-src.tar.gz) = 13110106
+SHA256 (coin-4.0.6-src.tar.gz) = 4EpgCAlZP+sqy+xCgoA9FnOSbd+h2fzUAvNewm/FLn4=
+SIZE (coin-4.0.6-src.tar.gz) = 13114463