fix(rust): make rust doc tests not run with nightly (#364) #2621

Job	Run time
ci / discover	16s
ci / check / .+check-bash	34s
ci / check / .+check-markdown	26s
ci / check / .+check-spelling	37s
ci / check / ./examples/go+check	28s
ci / check / ./examples/postgresql+check	34s
ci / check / ./examples/python+check	39s
ci / check / ./examples/rust+check	53s
ci / check / ./utilities/cql-to-d2+check	29s
ci / check / ./utilities/earthly-cache-watcher+check	30s
ci / check / ./utilities/fetcher+check	30s
ci / check / ./utilities/jorm-metrics-server+check	27s
ci / build / ./examples/go+build	38s
ci / build / ./examples/postgresql+build	4m 19s
ci / build / ./examples/rust+build	44s
ci / build / ./examples/wasm/c+build	29s
ci / build / ./utilities/fetcher+build	28s
ci / build / ./utilities/jorm-metrics-server+build	26s
ci / package	0s
ci / test / ./earthly/flutter+test-flutter-base	42s
ci / test / ./earthly/mdlint+test-mdlint	48s
ci / test / ./examples/go+test	27s
ci / test / ./examples/postgresql+test-1	1m 52s
ci / test / ./examples/postgresql+test-2	1m 33s
ci / test / ./examples/postgresql+test-3	1m 31s
ci / test / ./examples/postgresql+test-4	1m 30s
ci / test / ./utilities/cql-to-d2+test	40s
ci / test / ./utilities/fetcher+test	27s
ci / release / ./utilities/fetcher (docker)	40s
ci / docs / ./docs+docs	51s
ci / release / ./utilities/fetcher (github)	32s
ci / release / ./utilities/jorm-metrics-server (docker)	53s
ci / final	4s
ci / deploy	0s
	25m 57s

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