devel/rubygem-bootsnap: Update to 1.8.1

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

devel/rubygem-bootsnap/Makefile

 PORTNAME=	bootsnap
-PORTVERSION=	1.7.7
+PORTVERSION=	1.8.1
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-bootsnap/distinfo

-TIMESTAMP = 1628439622
-SHA256 (rubygem/bootsnap-1.7.7.gem) = 684868240b0c70a929e30c056ce8c03648a8cde217899a491b0b50d7045d63db
-SIZE (rubygem/bootsnap-1.7.7.gem) = 36352
+TIMESTAMP = 1632037858
+SHA256 (rubygem/bootsnap-1.8.1.gem) = 023d67f550c405b16e3442a07750b8e1c025dc10bcecdad837d8ec5125316a5b
+SIZE (rubygem/bootsnap-1.8.1.gem) = 36352