archivers/libdeflate: update the port to version 1.20

Switch to upstream release tarball to avoid potential
breakage due to GitHub's service policies.

PR:		273908
Reported by:	portscout

archivers/libdeflate/Makefile

 PORTNAME=	libdeflate
-PORTVERSION=	1.19
-DISTVERSIONPREFIX=	v
+PORTVERSION=	1.20
 CATEGORIES=	archivers
+MASTER_SITES=	https://github.com/ebiggers/${PORTNAME}/releases/download/v${PORTVERSION}/
 
 MAINTAINER=	danfe@FreeBSD.org
 COMMENT=	Fast, whole-buffer DEFLATE-based compression library
@@ -11,8 +11,6 @@ LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		cmake:testing pathfix
-USE_GITHUB=	yes
-GH_ACCOUNT=	ebiggers
 USE_LDCONFIG=	yes
 CMAKE_ON=	LIBDEFLATE_USE_SHARED_LIB
 CMAKE_TESTING_ON=	LIBDEFLATE_BUILD_TESTS

archivers/libdeflate/distinfo

-TIMESTAMP = 1694908083
-SHA256 (ebiggers-libdeflate-v1.19_GH0.tar.gz) = 27bf62d71cd64728ff43a9feb92f2ac2f2bf748986d856133cc1e51992428c25
-SIZE (ebiggers-libdeflate-v1.19_GH0.tar.gz) = 187684
+TIMESTAMP = 1711161506
+SHA256 (libdeflate-1.20.tar.gz) = c52cf0239fd644d71c9e88613dd7431a5306ebee1280c5791c71ca264869250a
+SIZE (libdeflate-1.20.tar.gz) = 183481