chore: replace regex with regex-lite, where appropriate (#1200)

As explained on https://crates.io/crates/regex-lite, `regex-lite` is a
lighter alternative to `regex` and seems to be sufficient for our
purposes.

codex-rs/tui/Cargo.toml

@@ -33,7 +33,7 @@ ratatui = { version = "0.29.0", features = [
     "unstable-rendered-line-info",
 ] }
 ratatui-image = "8.0.0"
-regex = "1"
+regex-lite = "0.1"
 serde_json = "1"
 shlex = "1.3.0"
 strum = "0.27.1"