Use const for the generated `versions` (#3471) #3211

Job	Run time
setup / Compile sqlite3 for tests (ubuntu-latest)	10s
setup / Compile sqlite3 for tests (macos-latest)	8s
setup / Compile sqlite3 for tests (windows-latest)	13s
setup / Get and cache Dart dependencies	31s
Documentation	4m 38s
drift package	2m 3s
drift_dev	7m 35s
Integration tests for migration tooling	1m 6s
Integration tests	2m 56s
sqlparser	38s
test_flutter (3.27)	2m 1s
test_flutter (3.29)	2m 5s
drift_web_ddc	3m 57s
Web integration tests	4m 45s
Drift web unit tests, dart2wasm, chrome	3m 55s
	36m 41s

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