Update Rust crate futures to 0.3.28 (#1843)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [futures](https://rust-lang.github.io/futures-rs) ([source](https://github.com/rust-lang/futures-rs)) | dependencies | patch | `0.3.27` -> `0.3.28` |

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### Release Notes

<details>
<summary>rust-lang/futures-rs</summary>

### [`v0.3.28`](https://github.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#&#8203;0328---2023-03-30)

[Compare Source](rust-lang/futures-rs@0.3.27...0.3.28)

-   Update to syn 2. This raises MSRV of utility crates to 1.56. ([#&#8203;2730](rust-lang/futures-rs#2730), [#&#8203;2733](rust-lang/futures-rs#2733))
-   Fix bug in `FlattenUnordered` ([#&#8203;2726](rust-lang/futures-rs#2726), [#&#8203;2728](rust-lang/futures-rs#2728))

</details>

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Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1843
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crates/search/Cargo.toml

@@ -14,7 +14,7 @@ async-trait = "0.1.68"
 cfg-if = "1.0.0"
 chrono = { version = "0.4.24", default-feature = false }
 env_logger = { version = "0.10.0", optional = true }
-futures = { version = "0.3.27", optional = true }
+futures = { version = "0.3.28", optional = true }
 lazy_static = "1.4.0"
 log = "0.4.17"
 quick-xml = { version = "0.28.1", optional = true, features = ["serialize"] }