devel/rubygem-bootsnap: Update to 1.9.4

Changes:	https://github.com/Shopify/bootsnap/blob/main/CHANGELOG.md

devel/rubygem-bootsnap/Makefile

 PORTNAME=	bootsnap
-PORTVERSION=	1.9.3
+PORTVERSION=	1.9.4
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-bootsnap/distinfo

-TIMESTAMP = 1638557234
-SHA256 (rubygem/bootsnap-1.9.3.gem) = e72dcbba87f8b618545206fef6bf68afb75dc55a5103178ae1fa8df2a9aff9a2
-SIZE (rubygem/bootsnap-1.9.3.gem) = 37376
+TIMESTAMP = 1642102599
+SHA256 (rubygem/bootsnap-1.9.4.gem) = 36ad7d3bab60bb9036cbc8f9c4880ff0793680b33ad7cda022a731adace824a6
+SIZE (rubygem/bootsnap-1.9.4.gem) = 37376