Unpin pifpaf #756

Job	Run time
doc (docs)	1m 38s
check (build)	42s
check (pep8)	38s
doc (docs-gnocchi-web)	1m 36s
test (py39, postgresql-file-upgrade-from-4.4)	1m 24s
test (py39, mysql-file)	1m 41s
test (py39, mysql-file-sqlalchemy14)	1m 41s
test (py39, mysql-swift)	1m 40s
test (py39, mysql-s3)	1m 41s
test (py39, postgresql-file)	1m 41s
test (py39, postgresql-file-sqlalchemy14)	2m 19s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	56s
test (py311, postgresql-file-upgrade-from-4.4)	1m 26s
test (py311, mysql-file)	1m 44s
test (py311, mysql-file-sqlalchemy14)	1m 42s
test (py311, mysql-swift)	1m 42s
test (py311, mysql-s3)	1m 41s
test (py311, postgresql-file)	1m 42s
test (py311, postgresql-file-sqlalchemy14)	1m 42s
test (py311, postgresql-swift)	1m 41s
test (py311, postgresql-s3)	1m 41s
	32m 39s

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