Update Rust crate toml to 0.7 (#378)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [toml](https://togithub.com/toml-rs/toml) | dependencies | minor |
`0.5` -> `0.7` |

---

### Release Notes

<details>
<summary>toml-rs/toml</summary>

###
[`v0.7.3`](https://togithub.com/toml-rs/toml/compare/toml-v0.7.2...toml-v0.7.3)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.7.2...toml-v0.7.3)

###
[`v0.7.2`](https://togithub.com/toml-rs/toml/compare/toml-v0.7.1...toml-v0.7.2)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.7.1...toml-v0.7.2)

###
[`v0.7.1`](https://togithub.com/toml-rs/toml/compare/toml-v0.7.0...toml-v0.7.1)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.7.0...toml-v0.7.1)

###
[`v0.7.0`](https://togithub.com/toml-rs/toml/compare/toml-v0.6.0...toml-v0.7.0)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.6.0...toml-v0.7.0)

###
[`v0.6.0`](https://togithub.com/toml-rs/toml/compare/toml-v0.5.11...toml-v0.6.0)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.5.11...toml-v0.6.0)

###
[`v0.5.11`](https://togithub.com/toml-rs/toml/compare/toml-v0.5.10...toml-v0.5.11)

[Compare
Source](https://togithub.com/toml-rs/toml/compare/toml-v0.5.10...toml-v0.5.11)

</details>

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agb-image-converter/Cargo.toml

@@ -12,7 +12,7 @@ proc-macro = true
 
 [dependencies]
 image = { version = "0.23", default-features = false, features = [ "png", "bmp" ] }
-toml = "0.5"
+toml = "0.7"
 serde = { version = "1", features = ["derive"] }
 syn = { version = "2", features = ["full"] }
 proc-macro2 = "1"