db: add sqlalchemy 2.0 support #574

Job	Run time
check (build)	1m 7s
check (pep8)	53s
test (py38, mysql-ceph-upgrade-from-4.4)	1m 53s
test (py38, postgresql-file-upgrade-from-4.4)	1s
test (py38, mysql-file)	1m 21s
test (py38, mysql-file-sqlalchemy14)	1m 20s
test (py38, mysql-swift)	1m 3s
test (py38, mysql-s3)	1m 12s
test (py38, mysql-ceph)	2m 16s
test (py38, postgresql-file)	1s
test (py38, postgresql-file-sqlalchemy14)	1s
test (py38, postgresql-swift)	1s
test (py38, postgresql-s3)	1s
test (py38, postgresql-ceph)	1s
test (py39, postgresql-file-upgrade-from-4.4)	1s
test (py39, mysql-file)	1s
test (py39, mysql-file-sqlalchemy14)	1s
test (py39, mysql-swift)	1s
test (py39, mysql-s3)	1s
test (py39, postgresql-file)	1s
test (py39, postgresql-file-sqlalchemy14)	1s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	1s
test (py311, postgresql-file-upgrade-from-4.4)	2m 19s
test (py311, mysql-file)	2m 23s
test (py311, mysql-file-sqlalchemy14)	2m 30s
test (py311, mysql-swift)	2m 20s
test (py311, mysql-s3)	2m 9s
test (py311, postgresql-file)	2m 14s
test (py311, postgresql-file-sqlalchemy14)	2m 5s
test (py311, postgresql-swift)	2m 17s
test (py311, postgresql-s3)	2m 16s
doc (docs)	2m 10s
doc (docs-gnocchi-web)	2m 13s
	36m 16s

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