fix: register deferred raster feature

Signed-off-by: cpendery <cpendery@vt.edu>

Author: cpendery

crates/tui-test/Cargo.toml

@@ -21,6 +21,9 @@ recording-font-jetbrains-mono = []
 recording-font-jetbrains-mono-styles = ["recording-font-jetbrains-mono"]
 recording-font-jetbrains-mono-full = ["recording-font-jetbrains-mono-styles"]
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(feature, values("recording-raster"))'] }
+
 [dependencies]
 alacritty_terminal.workspace = true
 anyhow.workspace = true