Update dependency flake8-tergeo to v26.6.1.1 (#634)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [flake8-tergeo](https://redirect.github.com/SAP/flake8-tergeo)
([changelog](https://redirect.github.com/SAP/flake8-tergeo/blob/main/CHANGELOG.md))
| `==26.5.28.0` → `==26.6.1.2` |
![age](https://developer.mend.io/api/mc/badges/age/pypi/flake8-tergeo/26.6.1.2?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/flake8-tergeo/26.5.28.0/26.6.1.2?slim=true)
|

---

### Release Notes

<details>
<summary>SAP/flake8-tergeo (flake8-tergeo)</summary>

###
[`v26.6.1.2`](https://redirect.github.com/SAP/flake8-tergeo/blob/HEAD/CHANGELOG.md#26612-2026-06-01)

[Compare
Source](https://redirect.github.com/SAP/flake8-tergeo/compare/v26.6.1.1...v26.6.1.2)

##### Features

- FTP240 ignores now the usage of `unitest.mock` attributes in
  - type aliases
  - class definitions
  - `typing.cast` calls

###
[`v26.6.1.1`](https://redirect.github.com/SAP/flake8-tergeo/blob/HEAD/CHANGELOG.md#26611-2026-06-01)

[Compare
Source](https://redirect.github.com/SAP/flake8-tergeo/compare/v26.6.1.0...v26.6.1.1)

##### Fixes

- Fixed an issue causing FTP146 to be incorrectly reported for Python
versions prior to 3.12

###
[`v26.6.1.0`](https://redirect.github.com/SAP/flake8-tergeo/blob/HEAD/CHANGELOG.md#26610-2026-06-01)

[Compare
Source](https://redirect.github.com/SAP/flake8-tergeo/compare/v26.5.28.0...v26.6.1.0)

##### Fixes

- Fixed an issue causing FTP145 to be incorrectly reported for Python
versions prior to 3.12

</details>

---

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pyproject.toml

@@ -66,7 +66,7 @@ dev = [
     "black==26.5.1",
     "pre-commit==4.6.0",
     "flake8==7.3.0",
-    "flake8-tergeo==26.5.28.0",
+    "flake8-tergeo==26.6.1.2",
     "pylint==4.0.5",
     "mypy==2.1.0",
     "types-hdbcli==2.25.0.20260518",