Update Rust crate base64 to 0.21.2 (#1907)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [base64](https://github.com/marshallpierce/rust-base64) | dependencies | patch | `0.21.0` -> `0.21.2` |

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### Release Notes

<details>
<summary>marshallpierce/rust-base64</summary>

### [`v0.21.2`](https://github.com/marshallpierce/rust-base64/blob/HEAD/RELEASE-NOTES.md#&#8203;0212)

[Compare Source](marshallpierce/rust-base64@v0.21.1...v0.21.2)

-   Rollback MSRV to 1.57.0 -- only dev dependencies need 1.60, not the main code

### [`v0.21.1`](https://github.com/marshallpierce/rust-base64/blob/HEAD/RELEASE-NOTES.md#&#8203;0211)

[Compare Source](marshallpierce/rust-base64@v0.21.0...v0.21.1)

-   Remove the possibility of panicking during decoded length calculations
-   `DecoderReader` no longer sometimes erroneously ignores padding  [#&#8203;226](marshallpierce/rust-base64#226)

#### Breaking changes

-   `Engine.internal_decode` return type changed
-   Update MSRV to 1.60.0

</details>

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Co-authored-by: cabr2-bot <[email protected]>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1907
Reviewed-by: crapStone <[email protected]>
Co-authored-by: Calciumdibromid Bot <[email protected]>
Co-committed-by: Calciumdibromid Bot <[email protected]>

crates/config/Cargo.toml

@@ -10,7 +10,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-base64 = "0.21.0"
+base64 = "0.21.2"
 directories-next = "2.0.0"
 lazy_static = "1.4.0"
 log = "0.4.19"