Use netCDF-c v4.9.3 #370

Job	Run time
rustfmt	41s
conda (ubuntu, conda-forge, stable)	45s
Address sanitizer	1m 24s
conda (windows, conda-forge, stable)	3m 26s
mpi-runner	1m 27s
conda (macos, conda-forge, stable)	1m 5s
static builds (ubuntu-latest, stable)	1m 21s
static builds (windows-latest, stable-msvc)	4m 57s
test apt (stable)	35s
Spell checking (typos)	5s
static builds (windows-latest, stable-gnu)	4m 58s
test apt (beta)	41s
static builds (macos-12, stable)	3m 7s
test apt (nightly)	48s
static builds (macos-latest, stable)	2m 0s
	27m 20s

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