Add a `depth_bias` to `Material2d` #32680

Job	Run time
check-bevy-internal-imports	5s
check-missing-examples-in-docs	39s
build (windows-latest)	3m 31s
check-doc	5m 3s
build (ubuntu-latest)	1m 56s
ci	1m 34s
build (macos-latest)	3m 39s
miri	6m 14s
run-examples-on-windows-dx12	11m 49s
toml	5s
check-missing-features-in-docs	34s
markdownlint	1m 15s
check-compiles	2m 22s
msrv	51s
build-wasm	40s
	40m 17s

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