Allow empty writeReturning for updates #3230

Job	Run time
setup / Compile sqlite3 for tests (ubuntu-latest)	11s
setup / Get and cache Dart dependencies	27s
setup / Compile sqlite3 for tests (macos-latest)	10s
setup / Compile sqlite3 for tests (windows-latest)	19s
drift package	2m 2s
drift_dev	7m 44s
Integration tests for migration tooling	1m 6s
Documentation	4m 36s
Integration tests	3m 1s
sqlparser	37s
test_flutter (3.27)	2m 12s
test_flutter (3.29)	2m 14s
Drift web unit tests, dart2wasm, chrome	3m 58s
Web integration tests	4m 52s
drift_web_ddc	3m 46s
	37m 15s

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