Update Rust crate log to 0.4.20 (#19)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [log](https://github.com/rust-lang/log) | dependencies | patch |
`0.4.19` -> `0.4.20` |

---

### Release Notes

<details>
<summary>rust-lang/log (log)</summary>

###
[`v0.4.20`](https://github.com/rust-lang/log/blob/HEAD/CHANGELOG.md#0420---2023-07-11)

[Compare
Source](https://github.com/rust-lang/log/compare/0.4.19...0.4.20)

- Remove rustversion dev-dependency by
[@&#8203;Thomasdezeeuw](https://github.com/Thomasdezeeuw) in
[https://github.com/rust-lang/log/pull/568](https://github.com/rust-lang/log/pull/568)
- Remove `local_inner_macros` usage by
[@&#8203;EFanZh](https://github.com/EFanZh) in
[https://github.com/rust-lang/log/pull/570](https://github.com/rust-lang/log/pull/570)

</details>

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Cargo.toml

@@ -9,7 +9,7 @@ edition = "2021"
 envy = "0.4.2"
 hyper = {version="0.14.27", features = ["full"] }
 lazy_static = "1.4.0"
-log = "0.4.19"
+log = "0.4.20"
 prometheus = {version="0.13.3", features = ["process"] }
 prometheus-http-query = "0.6.6"
 reqwest = {version="0.11.18", features = ["blocking", "json"] }