use tomli for python 3.10, otherwise tomllib #38

Job	Run time
test-langs (ubuntu-latest, 3.10, c)	1m 59s
test-langs (ubuntu-latest, 3.10, cxx)	2m 9s
test-langs (ubuntu-latest, 3.10, python)	1m 49s
test-langs (ubuntu-latest, 3.10, fortran)	2m 19s
test-langs (ubuntu-latest, 3.11, c)	1m 58s
test-langs (ubuntu-latest, 3.11, cxx)	1m 58s
test-langs (ubuntu-latest, 3.11, python)	2m 7s
test-langs (ubuntu-latest, 3.11, fortran)	2m 24s
test-langs (ubuntu-latest, 3.12, c)	1m 34s
test-langs (ubuntu-latest, 3.12, cxx)	1m 42s
test-langs (ubuntu-latest, 3.12, python)	1m 52s
test-langs (ubuntu-latest, 3.12, fortran)	1m 58s
test-langs (macos-latest, 3.10, c)	5m 36s
test-langs (macos-latest, 3.10, cxx)	4m 16s
test-langs (macos-latest, 3.10, python)	4m 44s
test-langs (macos-latest, 3.10, fortran)	5m 2s
test-langs (macos-latest, 3.11, c)	6m 14s
test-langs (macos-latest, 3.11, cxx)	3m 56s
test-langs (macos-latest, 3.11, python)	4m 3s
test-langs (macos-latest, 3.11, fortran)	10m 11s
test-langs (macos-latest, 3.12, c)	7m 11s
test-langs (macos-latest, 3.12, cxx)	4m 31s
test-langs (macos-latest, 3.12, python)	5m 16s
test-langs (macos-latest, 3.12, fortran)	4m 25s
	1h 29m 14s

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