add serde subfeature to tiberius-config (#334) #504

Job	Run time
Build docs	1m 9s
Cargo fmt and clippy	1m 11s
set-rust-versions	6s
cargo-audit	12s
Test postgres (stable)	1m 37s
test-macros-and-cli (stable, windows-latest)	4m 28s
Test postgres (nightly)	1m 48s
Test mysql (stable)	1m 59s
test-macros-and-cli (stable, ubuntu-latest)	1m 47s
Test mysql-async (stable)	1m 8s
Test mysql (nightly)	2m 20s
Test postgres (1.75)	1m 53s
test-macros-and-cli (nightly, windows-latest)	4m 20s
Test mysql-async (nightly)	1m 18s
Test mysql (1.75)	2m 3s
Test mysql-async (1.75)	1m 12s
test-macros-and-cli (nightly, ubuntu-latest)	1m 56s
Test Sqlite (stable)	1m 45s
test-macros-and-cli (1.75, windows-latest)	4m 5s
Test Sqlite (nightly)	1m 52s
Test tiberius (stable)	2m 1s
test-macros-and-cli (1.75, ubuntu-latest)	2m 4s
Test Sqlite (1.75)	1m 51s
Test tokio-postgres (stable)	50s
Test tiberius (nightly)	2m 10s
Test tiberius (1.75)	1m 53s
Test tokio-postgres (nightly)	1m 3s
Test tokio-postgres (1.75)	1m 12s
CI is green	1s
	51m 14s

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