fix: support pytest on python 3.12 wrt Fraction formatting change #968

Job	Run time
test-macos (3.9)	4m 58s
test-macos (3.9, numpy>=1.21,<2.0.0)	6m 10s
test-macos (3.10)	5m 10s
test-macos (3.10, numpy>=1.21,<2.0.0)	5m 35s
test-macos (3.11)	5m 40s
test-macos (3.11, numpy>=1.21,<2.0.0)	6m 7s
test-linux (3.9)	3m 54s
test-linux (3.9, uncertainties==3.1.6)	5m 1s
test-linux (3.9, uncertainties>=3.1.6,<4.0.0)	5m 27s
test-linux (3.9, numpy>=1.21,<2.0.0)	5m 31s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	4m 21s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	4m 20s
test-linux (3.10)	5m 36s
test-linux (3.10, uncertainties==3.1.6)	4m 23s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	4m 40s
test-linux (3.10, numpy>=1.21,<2.0.0)	5m 49s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	7m 17s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	4m 41s
test-linux (3.11)	3m 59s
test-linux (3.11, uncertainties==3.1.6)	4m 56s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	4m 29s
test-linux (3.11, numpy>=1.21,<2.0.0)	4m 33s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	6m 48s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	4m 45s
test-linux (3.9, numpy, matplotlib==2.2.5)	6m 36s
test-linux (3.9, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz ba...	6m 48s
test-windows (3.9, numpy>=1.21,<2.0.0)	1m 30s
test-windows (3.10, numpy>=1.21,<2.0.0)	1m 8s
test-windows (3.11, numpy>=1.21,<2.0.0)	1m 7s
	2h 21m 19s

Provide feedback