www/py-google-cloud-bigtable: Update to 2.4.0

Changes:	https://github.com/googleapis/python-bigtable/releases

www/py-google-cloud-bigtable/Makefile

 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 
 PORTNAME=	google-cloud-bigtable
-PORTVERSION=	2.3.3
+PORTVERSION=	2.4.0
 CATEGORIES=	www python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

www/py-google-cloud-bigtable/distinfo

-TIMESTAMP = 1628103172
-SHA256 (google-cloud-bigtable-2.3.3.tar.gz) = e2b3271a70d0b6ebb9e66ceb6247898eb534ca441777ea4e600c36c9572a2404
-SIZE (google-cloud-bigtable-2.3.3.tar.gz) = 267778
+TIMESTAMP = 1632773670
+SHA256 (google-cloud-bigtable-2.4.0.tar.gz) = b8472c91b05159f20121fcca6ebdc2a3b5648d68158ec747860914279b6b983b
+SIZE (google-cloud-bigtable-2.4.0.tar.gz) = 267203