build(deps): update smol-potat requirement from ~0.2 to ~0.3

Updates the requirements on [smol-potat](https://github.com/wusyong/smol-potat) to permit the latest version.
- [Release notes](https://github.com/wusyong/smol-potat/releases)
- [Commits](https://github.com/wusyong/smol-potat/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

examples/Cargo.toml

@@ -10,7 +10,7 @@ autobins = false
 [dev-dependencies]
 cfg-if = "~0.1"
 heim = { path = "../heim", features = ["full"] }
-smol-potat = "~0.2"
+smol-potat = "~0.3"
 futures-timer = "~3.0"
 
 futures = "~0.3"