Update Rust crate cargo_toml to v0.20.4 (#15276)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [cargo_toml](https://lib.rs/cargo_toml)
([source](https://gitlab.com/lib.rs/cargo_toml)) |
workspace.dependencies | patch | `0.20.2` -> `0.20.4` |

---

### Release Notes

<details>
<summary>lib.rs/cargo_toml (cargo_toml)</summary>

###
[`v0.20.4`](https://gitlab.com/lib.rs/cargo_toml/compare/v0.20.3...v0.20.4)

[Compare
Source](https://gitlab.com/lib.rs/cargo_toml/compare/v0.20.3...v0.20.4)

###
[`v0.20.3`](https://gitlab.com/lib.rs/cargo_toml/compare/v0.20.2...v0.20.3)

[Compare
Source](https://gitlab.com/lib.rs/cargo_toml/compare/v0.20.2...v0.20.3)

</details>

---

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---

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---

Release Notes:

- N/A

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