deps: update dependency virtualenv to v20.26.4 (#3177)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [virtualenv](https://redirect.github.com/pypa/virtualenv) |
`==20.26.3` -> `==20.26.4` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/virtualenv/20.26.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/virtualenv/20.26.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/virtualenv/20.26.3/20.26.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/virtualenv/20.26.3/20.26.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>pypa/virtualenv (virtualenv)</summary>

###
[`v20.26.4`](https://redirect.github.com/pypa/virtualenv/releases/tag/20.26.4)

[Compare
Source](https://redirect.github.com/pypa/virtualenv/compare/20.26.3...20.26.4)

<!-- Release notes generated using configuration in .github/release.yml
at 20.26.4 -->

#### What's Changed

- release 20.26.3 by
[@&#8203;gaborbernat](https://redirect.github.com/gaborbernat) in
[pypa/virtualenv#2742
- Fix whitespace around backticks in changelog by
[@&#8203;edmorley](https://redirect.github.com/edmorley) in
[pypa/virtualenv#2751
- Test latest Python 3.13 by
[@&#8203;hugovk](https://redirect.github.com/hugovk) in
[pypa/virtualenv#2752
- Fix typo in Nushell activation script by
[@&#8203;edmorley](https://redirect.github.com/edmorley) in
[pypa/virtualenv#2754
- GitHub Actions: Replace deprecated macos-12 with macos-13 by
[@&#8203;hugovk](https://redirect.github.com/hugovk) in
[pypa/virtualenv#2756
- Fix
[#&#8203;2728](https://redirect.github.com/pypa/virtualenv/issues/2728):
Activating venv create unwanted console output by
[@&#8203;ShootGan](https://redirect.github.com/ShootGan) in
[pypa/virtualenv#2748
- Upgrade bundled wheels by
[@&#8203;gaborbernat](https://redirect.github.com/gaborbernat) in
[pypa/virtualenv#2760

#### New Contributors

- [@&#8203;ShootGan](https://redirect.github.com/ShootGan) made their
first contribution in
[pypa/virtualenv#2748

**Full Changelog**:
pypa/virtualenv@20.26.3...20.26.4

</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

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/googleapis/sdk-platform-java).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC41OS4yIiwidXBkYXRlZEluVmVyIjoiMzguNTkuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

library_generation/requirements.txt

@@ -492,9 +492,9 @@ urllib3==2.2.2 \
     --hash=sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472 \
     --hash=sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168
     # via requests
-virtualenv==20.26.3 \
-    --hash=sha256:4c43a2a236279d9ea36a0d76f98d84bd6ca94ac4e0f4a3b9d46d05e10fea542a \
-    --hash=sha256:8cc4a31139e796e9a7de2cd5cf2489de1217193116a8fd42328f1bd65f434589
+virtualenv==20.26.4 \
+    --hash=sha256:48f2695d9809277003f30776d155615ffc11328e6a0a8c1f0ec80188d7874a55 \
+    --hash=sha256:c17f4e0f3e6036e9f26700446f85c76ab11df65ff6d8a9cbfad9f71aabfcf23c
     # via nox
 watchdog==4.0.2 \
     --hash=sha256:0b4359067d30d5b864e09c8597b112fe0a0a59321a0f331498b013fb097406b4 \