chore(deps): update dependency isort to v8 (#418)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [isort](https://github.com/PyCQA/isort) ([changelog](https://github.com/PyCQA/isort/releases)) | `<7.0.1,>=7.0.0` → `<8.0.1,>=8.0.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/isort/8.0.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/isort/7.0.0/8.0.0?slim=true) |

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### Release Notes

<details>
<summary>PyCQA/isort (isort)</summary>

### [`v8.0.0`](https://github.com/PyCQA/isort/blob/HEAD/CHANGELOG.md#800-February-19-2026)

[Compare Source](https://github.com/PyCQA/isort/compare/7.0.0...8.0.0)

- Removed `--old-finders` and `--magic-placement` flags and `old_finders` configuration option. The legacy finder logic that relied on environment introspection has been removed ([#&#8203;2445](https://github.com/PyCQA/isort/issues/2445)) [@&#8203;joao-faria-dev](https://github.com/joao-faria-dev)
  - Update the `plone` profile to not clash with `black` ([#&#8203;2456](https://github.com/PyCQA/isort/issues/2456)) [@&#8203;ale-rt](https://github.com/ale-rt)

</details>

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### Configuration

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♻ **Rebasing**: Whenever PR is behind base branch, 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

---

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Co-authored-by: Luke Tainton <luke@tainton.uk>
Reviewed-on: https://git.tainton.uk/repos/roboluke/pulls/418
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 authors = [
     {name = "Luke Tainton", email = "luke@tainton.uk"},
 ]
-requires-python = "<3.14,>=3.11"
+requires-python = "<3.14,>=3.13"
 dependencies = [
     "webex-bot<1.2.1,>=1.2.0",
     "datetime<6.1,>=6",
@@ -17,7 +17,7 @@ dependencies = [
 dev = [
     "black<26.1.1,>=26.1.0",
     "coverage<8.0.0,>=7.6.10",
-    "isort<7.0.1,>=7.0.0",
+    "isort<8.0.1,>=8.0.0",
     "pylint<4.1.0,>=4.0.0",
     "pylint-exit<2.0.0,>=1.2.0",
     "pytest<9.1.0,>=9.0.0",