Bump minimum python version #880

Job	Run time
doc (docs)	1m 46s
doc (docs-gnocchi-web)	1m 35s
test (py39, postgresql-file-upgrade-from-4.5)	2m 51s
check (build)	42s
test (py39, mysql-file)	3m 17s
check (pep8)	39s
test (py39, mysql-file-sqlalchemy14)	3m 12s
test (py39, mysql-swift)	3m 23s
test (py39, mysql-s3)	3m 57s
test (py39, postgresql-file)	2m 47s
test (py39, postgresql-file-sqlalchemy14)	2m 53s
test (py39, postgresql-swift)	3m 8s
test (py39, postgresql-s3)	3m 41s
test (py311, postgresql-file-upgrade-from-4.5)	2m 47s
test (py311, mysql-file)	3m 5s
test (py311, mysql-file-sqlalchemy14)	2m 53s
test (py311, mysql-swift)	3m 21s
test (py311, mysql-s3)	3m 46s
test (py311, postgresql-file)	2m 48s
test (py311, postgresql-file-sqlalchemy14)	2m 40s
test (py311, postgresql-swift)	3m 15s
test (py311, postgresql-s3)	3m 17s
test (py312, mysql-ceph-upgrade-from-4.5)	2m 35s
test (py312, postgresql-file-upgrade-from-4.5)	2m 45s
test (py312, mysql-file)	2m 53s
test (py312, mysql-file-sqlalchemy14)	2m 50s
test (py312, mysql-swift)	3m 13s
test (py312, mysql-s3)	3m 44s
test (py312, postgresql-file)	2m 57s
test (py312, postgresql-file-sqlalchemy14)	2m 40s
test (py312, postgresql-swift)	3m 9s
test (py312, postgresql-s3)	3m 28s
	1h 31m 57s

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