textproc/py-transifex-client: Mark DEPRECATED

Transifex is retiring the v2 API and has introduced a new go-based
client for v3 API. adridg@ has ported the new client which is available
at textproc/go-transifex-client.

The v2 API application doesn't work anymore (april 2023), the API it
wants to talk to seems to be dead or moved to app.transifex.com.

PR:		271050
Reported by:	adridg

textproc/py-transifex-client/Makefile

@@ -11,6 +11,9 @@ WWW=		https://www.transifex.com
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+DEPRECATED=	Upstream switched to go based api client (textproc/go-transifex-client)
+EXPIRATION_DATE=	2023-06-30
+
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}gitpython>0:devel/py-gitpython@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}python-slugify>=1.26.0:textproc/py-python-slugify@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}requests>=2.19.1:www/py-requests@${PY_FLAVOR} \