chore(deps): update rust crate mimalloc-rust to 0.2.0 (open-telemetry#558)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [mimalloc-rust](https://redirect.github.com/lemonhx/mimalloc-rust) |
dev-dependencies | minor | `0.1.5` -> `0.2.0` |

---

### Configuration

📅 **Schedule**: Branch creation - "before 8am on Monday" (UTC),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/open-telemetry/otel-arrow).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC40MC4zIiwidXBkYXRlZEluVmVyIjoiNDAuNDAuMyIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiZGVwZW5kZW5jaWVzIl19-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Laurent Quérel <l.querel@f5.com>

Author: renovate[bot]

rust/beaubourg/Cargo.toml

@@ -39,7 +39,7 @@ serde_yaml = "0.8.26"
 color-eyre = "0.6.2"
 tracing = "0.1.41"
 tracing-subscriber = "0.3.18"
-mimalloc-rust = "0.1.5"
+mimalloc-rust = "0.2.0"
 socket2 = { version="0.5.8", features = ["all"]}
 tokio-stream = { version = "0.1.17", features = ["net"] }
 once_cell = "1.19.0"