Use netCDF-c v4.9.3 #375

Job	Run time
conda (ubuntu, conda-forge, stable)	55s
conda (windows, conda-forge, stable)	3m 31s
conda (macos, conda-forge, stable)	57s
rustfmt	55s
test apt (stable)	36s
static builds (ubuntu-latest, stable)	1m 12s
test apt (beta)	38s
static builds (windows-latest, stable-msvc)	6m 16s
Spell checking (typos)	4s
test apt (nightly)	1m 1s
static builds (windows-latest, stable-gnu)	5m 24s
static builds (macos-12, stable)	1s
Address sanitizer	1m 22s
mpi-runner	1m 23s
static builds (macos-latest, stable)	1m 33s
	25m 48s

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