fix(rust): make rust doc tests not run with nightly (#364) #2620

Job	Run time
ci / discover	32s
ci / check / .+check-bash	27s
ci / check / .+check-markdown	41s
ci / check / .+check-spelling	50s
ci / check / ./examples/go+check	41s
ci / check / ./examples/postgresql+check	32s
ci / check / ./examples/python+check	25s
ci / check / ./examples/rust+check	49s
ci / check / ./utilities/cql-to-d2+check	38s
ci / check / ./utilities/earthly-cache-watcher+check	37s
ci / check / ./utilities/fetcher+check	31s
ci / check / ./utilities/jorm-metrics-server+check	27s
ci / build / ./examples/go+build	35s
ci / build / ./examples/postgresql+build	4m 5s
ci / build / ./examples/rust+build	53s
ci / build / ./examples/wasm/c+build	28s
ci / build / ./utilities/fetcher+build	28s
ci / build / ./utilities/jorm-metrics-server+build	32s
ci / package	0s
ci / test / ./earthly/flutter+test-flutter-base	42s
ci / test / ./earthly/mdlint+test-mdlint	30s
ci / test / ./examples/go+test	28s
ci / test / ./examples/postgresql+test-1	2m 1s
ci / test / ./examples/postgresql+test-2	1m 49s
ci / test / ./examples/postgresql+test-3	1m 36s
ci / test / ./examples/postgresql+test-4	1m 29s
ci / test / ./utilities/cql-to-d2+test	31s
ci / test / ./utilities/fetcher+test	28s
ci / release / ./utilities/fetcher (docker)	1m 8s
ci / docs / ./docs+docs	1m 6s
ci / release / ./utilities/fetcher (github)	41s
ci / release / ./utilities/jorm-metrics-server (docker)	44s
ci / deploy	0s
ci / final	0s
	27m 24s

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