chore(deps): update pre-commit hook psf/black-pre-commit-mirror to v26 (#790)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[psf/black-pre-commit-mirror](https://redirect.github.com/psf/black-pre-commit-mirror)
| repository | major | `25.12.0` → `26.1.0` |

Note: The `pre-commit` manager in Renovate is not supported by the
`pre-commit` maintainers or community. Please do not report any problems
there, instead [create a Discussion in the Renovate
repository](https://redirect.github.com/renovatebot/renovate/discussions/new)
if you have any questions.

---

### Release Notes

<details>
<summary>psf/black-pre-commit-mirror
(psf/black-pre-commit-mirror)</summary>

###
[`v26.1.0`](https://redirect.github.com/psf/black-pre-commit-mirror/compare/25.12.0...26.1.0)

[Compare
Source](https://redirect.github.com/psf/black-pre-commit-mirror/compare/25.12.0...26.1.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
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

---

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scripts/vendor.py

@@ -34,28 +34,24 @@ def apply_code_modifications(source_path: Path):
         # Wrap requests imports
         content = re.sub(
             r"import requests",
-            dedent(
-                r"""
+            dedent(r"""
                 try:
                     import requests
                 except ImportError:
                     requests = None
-                """
-            ).strip(),
+                """).strip(),
             content,
         )
 
         # Wrap dateutil imports
         content = re.sub(
             r"from dateutil.parser import isoparse",
-            dedent(
-                r"""
+            dedent(r"""
                 try:
                     from dateutil.parser import isoparse
                 except ImportError:
                     isoparse = None
-                """
-            ).strip(),
+                """).strip(),
             content,
         )