Fix deprecation warning for old migrations import #3132

Job	Run time
setup / Get and cache Dart dependencies	34s
setup / Compile sqlite3 for tests (ubuntu-latest)	11s
setup / Compile sqlite3 for tests (macos-latest)	9s
setup / Compile sqlite3 for tests (windows-latest)	13s
drift package	2m 10s
Documentation	4m 41s
Integration tests for migration tooling	1m 8s
drift_dev	6m 42s
test_flutter (3.24)	2m 17s
sqlparser	47s
test_flutter (3.27)	2m 13s
Integration tests	2m 52s
Drift web unit tests, dart2wasm, ${{ matrix.browser }}	0s
Web integration tests	0s
drift_web_ddc	0s
	23m 57s

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