Update rectangle-pack requirement from 0.3 to 0.4 (#2086)

Updates the requirements on [rectangle-pack](https://github.com/chinedufn/rectangle-pack) to permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/chinedufn/rectangle-pack/commits">compare view</a></li>
</ul>
</details>
<br />


Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)


</details>

crates/bevy_sprite/Cargo.toml

@@ -27,7 +27,7 @@ bevy_utils = { path = "../bevy_utils", version = "0.5.0" }
 bevy_window = { path = "../bevy_window", version = "0.5.0" }
 
 # other
-rectangle-pack = "0.3"
+rectangle-pack = "0.4"
 thiserror = "1.0"
 guillotiere = "0.6.0"
 serde = { version = "1", features = ["derive"] }