Update Rust crate boxcar to v0.2.6 (#7951)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [boxcar](https://redirect.github.com/ibraheemdev/boxcar) |
workspace.dependencies | patch | `0.2.5` -> `0.2.6` |

---

### Configuration

📅 **Schedule**: Branch creation - "before 4am 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/astral-sh/uv).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC45Ny4wIiwidXBkYXRlZEluVmVyIjoiMzguOTcuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiaW50ZXJuYWwiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Cargo.lock

@@ -361,9 +361,9 @@ dependencies = [
 
 [[package]]
 name = "boxcar"
-version = "0.2.5"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "510a90332002c1af3317ef6b712f0dab697f30bbe809b86965eac2923c0bca8e"
+checksum = "fba19c552ee63cb6646b75e1166d1bdb8a6d34a6d19e319dec88c8adadff2db3"
 
 [[package]]
 name = "bstr"