Use netCDF-c v4.9.3 #324

Job	Run time
test apt (stable)	38s
test apt (beta)	39s
mpi-runner	1m 34s
test apt (nightly)	42s
conda (ubuntu, conda-forge, stable)	1m 9s
Address sanitizer	1m 19s
conda (windows, conda-forge, stable)	3m 4s
conda (macos, conda-forge, stable)	1m 0s
rustfmt	58s
static builds (ubuntu-latest, stable)	1m 24s
static builds (windows-latest, stable-msvc)	4m 57s
static builds (windows-latest, stable-gnu)	5m 16s
static builds (macos-12, stable)	4m 29s
static builds (macos-latest, stable)	1m 44s
	28m 53s

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