fix newline handling for Windows in database configuration setup #468

Job	Run time
Cargo fmt and clippy	1m 21s
Build docs	1m 4s
cargo-audit	7s
set-rust-versions	3s
test-macros-and-cli (stable, windows-latest)	4m 31s
test-macros-and-cli (stable, ubuntu-latest)	1m 54s
Test mysql (stable)	1m 59s
Test mysql-async (stable)	1m 3s
test-macros-and-cli (nightly, windows-latest)	4m 19s
Test mysql (nightly)	2m 6s
Test postgres (stable)	1m 43s
Test mysql-async (nightly)	1m 13s
test-macros-and-cli (nightly, ubuntu-latest)	2m 6s
Test postgres (nightly)	1m 46s
Test mysql (1.75)	2m 6s
Test mysql-async (1.75)	1m 11s
test-macros-and-cli (1.75, windows-latest)	3m 49s
Test postgres (1.75)	1m 48s
test-macros-and-cli (1.75, ubuntu-latest)	1m 59s
Test Sqlite (stable)	1m 36s
Test tiberius (stable)	1m 51s
Test Sqlite (nightly)	1m 58s
Test tokio-postgres (stable)	47s
Test tiberius (nightly)	1m 58s
Test Sqlite (1.75)	1m 43s
Test tokio-postgres (nightly)	55s
Test tiberius (1.75)	1m 54s
Test tokio-postgres (1.75)	59s
CI is green	1s
	49m 50s

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