ci(mergify): upgrade configuration to current format #883

Job	Run time
doc (docs)	1m 54s
check (build)	39s
doc (docs-gnocchi-web)	1m 34s
check (pep8)	38s
test (py39, postgresql-file-upgrade-from-4.5)	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-4.5)	2m 45s
test (py311, mysql-file)	2m 35s
test (py311, mysql-file-sqlalchemy14)	2m 43s
test (py311, mysql-swift)	2m 41s
test (py311, mysql-s3)	2m 49s
test (py311, postgresql-file)	2m 32s
test (py311, postgresql-file-sqlalchemy14)	2m 30s
test (py311, postgresql-swift)	2m 33s
test (py311, postgresql-s3)	2m 45s
test (py312, mysql-ceph-upgrade-from-4.5)	2m 35s
test (py312, postgresql-file-upgrade-from-4.5)	1s
test (py312, mysql-file)	2m 6s
test (py312, mysql-file-sqlalchemy14)	1m 9s
test (py312, mysql-swift)	1m 0s
test (py312, mysql-s3)	55s
test (py312, postgresql-file)	37s
test (py312, postgresql-file-sqlalchemy14)	46s
test (py312, postgresql-swift)	1s
test (py312, postgresql-s3)	1s
	37m 58s

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