Use netCDF-c v4.9.3 #372

Job	Run time
rustfmt	31s
mpi-runner	2m 12s
conda (ubuntu, conda-forge, stable)	1m 9s
Address sanitizer	1m 21s
conda (windows, conda-forge, stable)	3m 40s
static builds (ubuntu-latest, stable)	1m 16s
conda (macos, conda-forge, stable)	58s
test apt (stable)	33s
static builds (windows-latest, stable-msvc)	6m 9s
Spell checking (typos)	4s
static builds (windows-latest, stable-gnu)	5m 19s
test apt (beta)	42s
test apt (nightly)	39s
static builds (macos-12, stable)	1s
static builds (macos-latest, stable)	1m 32s
	26m 6s

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