Use netCDF-c v4.9.3 #322

Job	Run time
test apt (stable)	40s
static builds (ubuntu-latest, stable)	1m 23s
test apt (beta)	39s
static builds (windows-latest, stable-msvc)	4m 35s
test apt (nightly)	43s
Address sanitizer	1m 22s
static builds (windows-latest, stable-gnu)	4m 32s
conda (ubuntu, conda-forge, stable)	1m 1s
static builds (macos-11, stable)	1s
conda (windows, conda-forge, stable)	2m 9s
mpi-runner	1m 30s
static builds (macos-latest, stable)	1m 51s
conda (macos, conda-forge, stable)	1m 2s
rustfmt	41s
	22m 9s

Provide feedback