v0.2.3
Update gleam to 0.6 <!-- Reviewable:start --> This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/cgl-rs/26) <!-- Reviewable:end -->
Update gleam to 0.6 <!-- Reviewable:start --> This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/cgl-rs/26) <!-- Reviewable:end -->