ci(mergify): upgrade configuration to current format #885

Job	Run time
doc (docs)	1m 40s
check (build)	40s
test (py39, postgresql-file-upgrade-from-4.5)	1s
check (pep8)	44s
doc (docs-gnocchi-web)	1m 35s
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 48s
test (py311, mysql-file)	2m 36s
test (py311, mysql-file-sqlalchemy14)	2m 2s
test (py311, mysql-swift)	2m 40s
test (py311, mysql-s3)	2m 47s
test (py311, postgresql-file)	2m 31s
test (py311, postgresql-file-sqlalchemy14)	2m 36s
test (py311, postgresql-swift)	2m 30s
test (py311, postgresql-s3)	1m 56s
test (py312, mysql-ceph-upgrade-from-4.5)	1m 56s
test (py312, postgresql-file-upgrade-from-4.5)	1s
test (py312, mysql-file)	1m 14s
test (py312, mysql-file-sqlalchemy14)	1m 6s
test (py312, mysql-swift)	2s
test (py312, mysql-s3)	1s
test (py312, postgresql-file)	1s
test (py312, postgresql-file-sqlalchemy14)	1s
test (py312, postgresql-swift)	1s
test (py312, postgresql-s3)	1s
	31m 38s

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