databases/rubygem-dalli: Update to 3.2.8

Changes:	https://github.com/petergoldstein/dalli/blob/main/CHANGELOG.md

databases/rubygem-dalli/Makefile

 PORTNAME=	dalli
-PORTVERSION=	3.2.6
+PORTVERSION=	3.2.8
 CATEGORIES=	databases rubygems
 MASTER_SITES=	RG
 

databases/rubygem-dalli/distinfo

-TIMESTAMP = 1696001416
-SHA256 (rubygem/dalli-3.2.6.gem) = 879092a248bc0c8ff4b40ff233686d794422e8af4f3a5395c7bdc7432de0fd8c
-SIZE (rubygem/dalli-3.2.6.gem) = 44032
+TIMESTAMP = 1708449556
+SHA256 (rubygem/dalli-3.2.8.gem) = 2e63595084d91fae2655514a02c5d4fc0f16c0799893794abe23bf628bebaaa5
+SIZE (rubygem/dalli-3.2.8.gem) = 44544