security/py-keyrings.alt: adjust optional dependency (unbreak)

In commit a16d8f1, deprecation of `security/py-pycrypto' had
not been handled completely: one optional dependency which is off
by default was still referencing the expiring port.

According to release notes, EncryptedFileKeyring now supports both
pycryptodome and pycryptodomex (preferring the latter), so prefer
the latter.

Reported by:	someone on t.me/freebsd_ru

security/py-keyrings.alt/Makefile

@@ -29,7 +29,7 @@ ENCRYPTED_FILE_DESC=	Install pycrypto to support the Encrypted File backend
 GNOME_KEYRING_DESC=	Install GNOME Keyring to support the Gnome backend
 PYFS_DESC=		Install pyfilesystem to support the pyfs backend
 
-ENCRYPTED_FILE_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pycrypto>=2.5:security/py-pycrypto@${PY_FLAVOR}
+ENCRYPTED_FILE_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pycryptodomex>0:security/py-pycryptodomex@${PY_FLAVOR}
 GNOME_KEYRING_USES=		gnome
 GNOME_KEYRING_USE=		GNOME=pygobject3
 PYFS_RUN_DEPENDS=		${PYTHON_PKGNAMEPREFIX}fs>=0.5:devel/py-fs@${PY_FLAVOR}