chore(deps): update rust crate leptonic-theme to 0.3.0 (#17)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [leptonic-theme](https://github.com/lpotthast/leptonic-theme) |
build-dependencies | minor | `0.2.0` -> `0.3.0` |

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Cargo.toml

@@ -24,5 +24,5 @@ reqwasm = "0.5"
 wasm-bindgen-test = "0.3.0"
 
 [build-dependencies]
-leptonic-theme = "0.2.0"
+leptonic-theme = "0.3.0"
 leptos-tiptap-build = "0.2.4"