devel/rubygem-aws-sdk-mgn: Update to 1.29.0

Changes:	https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-sdk-mgn/CHANGELOG.md

devel/rubygem-aws-sdk-mgn/Makefile

 PORTNAME=	aws-sdk-mgn
-PORTVERSION=	1.28.0
+PORTVERSION=	1.29.0
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-aws-sdk-mgn/distinfo

-TIMESTAMP = 1700760360
-SHA256 (rubygem/aws-sdk-mgn-1.28.0.gem) = 6719fadb4b9cf5d484a709e2a9d213b14968184b1fb9dca60c3794bd6be89030
-SIZE (rubygem/aws-sdk-mgn-1.28.0.gem) = 71680
+TIMESTAMP = 1701364214
+SHA256 (rubygem/aws-sdk-mgn-1.29.0.gem) = 88684bfd01c3b9c409129481acd70fd2c53728e28bc7ad758cf6b3694be3c8e7
+SIZE (rubygem/aws-sdk-mgn-1.29.0.gem) = 71680