ci: install fr_FR locale to build docs #1127

Job	Run time
test-windows (3.9, numpy>=1.21,<2.0.0)	1m 37s
test-windows (3.10, numpy>=1.21,<2.0.0)	53s
test-linux (3.9)	1m 34s
test-windows (3.11, numpy>=1.21,<2.0.0)	1m 1s
test-linux (3.9, uncertainties==3.1.6)	1m 34s
test-linux (3.9, uncertainties>=3.1.6,<4.0.0)	1m 45s
test-linux (3.9, numpy>=1.21,<2.0.0)	1m 44s
test-macos (3.9)	1m 54s
test-macos (3.9, numpy>=1.21,<2.0.0)	2m 23s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	2m 20s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	2m 20s
test-linux (3.10)	1m 40s
test-macos (3.10)	3m 37s
test-linux (3.10, uncertainties==3.1.6)	1m 43s
test-macos (3.10, numpy>=1.21,<2.0.0)	3m 28s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	1m 39s
test-macos (3.11)	2m 7s
test-macos (3.11, numpy>=1.21,<2.0.0)	4m 0s
test-linux (3.10, numpy>=1.21,<2.0.0)	1m 44s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	2m 38s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	2m 28s
test-linux (3.11)	1m 29s
test-linux (3.11, uncertainties==3.1.6)	1m 31s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	1m 34s
test-linux (3.11, numpy>=1.21,<2.0.0)	1m 38s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	2m 17s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	2m 15s
test-linux (3.9, numpy, matplotlib==2.2.5)	3m 23s
test-linux (3.9, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz ba...	4m 1s
	1h 2m 17s

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