Fix azure-config.yaml to use snake_case for guard fields #18

Job	Run time
build (ubuntu-22.04-arm, aarch64-unknown-linux-musl, default)	4m 34s
test (windows-latest)	6h 5m 1s
build (macos-latest, aarch64-apple-darwin, default)	12m 53s
build (ubuntu-latest, x86_64-unknown-linux-musl, jemalloc)	5m 3s
test (ubuntu-latest)	6h 5m 0s
build (windows-latest, x86_64-pc-windows-msvc, default)	16m 56s
lint	3m 43s
	12h 53m 10s

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