security/py-pyblake2: deprecate and set to removal

External pyblake2 implementation was imported into python standard library
hashlib module since 3.6

https://github.com/dchest/pyblake2/blob/master/README.rst

The only consumers of it (security/py-pyaff4 and security/py-trezor) have
corresponding PRs to drop this dependency.

PR:		277135
Approved by:	antoine (maintainer)

security/py-pyblake2/Makefile

@@ -11,6 +11,9 @@ WWW=		https://github.com/dchest/pyblake2
 LICENSE=	CC0-1.0
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+DEPRECATED=	Reached it's End Of Life. Integrated into Python Standard Library
+EXPIRATION_DATE=2024-03-03
+
 USES=		python
 USE_PYTHON=	distutils autoplist
 TEST_ENV=	${MAKE_ENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}