www/py-drf-yasg: Update to 1.21.8

Changelog:

https://github.com/axnsan12/drf-yasg/releases/tag/1.21.8

www/py-drf-yasg/Makefile

 PORTNAME=	drf-yasg
-DISTVERSION=	1.21.7
-PORTREVISION=	2
+DISTVERSION=	1.21.8
 CATEGORIES=	www python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

www/py-drf-yasg/distinfo

-TIMESTAMP = 1690889016
-SHA256 (drf-yasg-1.21.7.tar.gz) = 4c3b93068b3dfca6969ab111155e4dd6f7b2d680b98778de8fd460b7837bdb0d
-SIZE (drf-yasg-1.21.7.tar.gz) = 4512723
+TIMESTAMP = 1730630304
+SHA256 (drf-yasg-1.21.8.tar.gz) = cbb7f81c3d140f2207392b4bc5dde65384eeb58e1b7eea1a6d641dec2f7352a9
+SIZE (drf-yasg-1.21.8.tar.gz) = 4512662