Downgrade nightly CI until rustc is fixed (#985) #2212

Job	Run time
Lint and Unit test	4m 46s
Build and test docker images	6m 11s
Build aarch64-apple-darwin	5m 2s
Build debian-x86_64	5m 16s
Build x86_64-apple-darwin	2m 56s
Build x86_64-pc-windows-msvc	3m 53s
Build x86_64-unknown-linux-gnu	1m 12s
Test on macOS-latest	4m 55s
Test postgis:11-3.0-alpine sslmode=disable	3m 13s
Test on windows-latest	2m 1s
Test postgis:14-3.3-alpine sslmode=disable	7m 20s
Test on ubuntu-latest	55s
Test postgis:15-3.3 sslmode=require	6m 17s
Package	1m 11s
CI Finished	1s
	55m 9s

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