deps: update dependency virtualenv to v20.26.5 (googleapis#3212)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [virtualenv](https://redirect.github.com/pypa/virtualenv) |
`==20.26.4` -> `==20.26.5` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/virtualenv/20.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/virtualenv/20.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/virtualenv/20.26.4/20.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/virtualenv/20.26.4/20.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
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### Release Notes

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

###
[`v20.26.5`](https://redirect.github.com/pypa/virtualenv/compare/20.26.4...20.26.5)

[Compare
Source](https://redirect.github.com/pypa/virtualenv/compare/20.26.4...20.26.5)

</details>

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Author: renovate-bot

library_generation/requirements.txt

@@ -492,9 +492,9 @@ urllib3==2.2.3 \
     --hash=sha256:ca899ca043dcb1bafa3e262d73aa25c465bfb49e0bd9dd5d59f1d0acba2f8fac \
     --hash=sha256:e7d814a81dad81e6caf2ec9fdedb284ecc9c73076b62654547cc64ccdcae26e9
     # via requests
-virtualenv==20.26.4 \
-    --hash=sha256:48f2695d9809277003f30776d155615ffc11328e6a0a8c1f0ec80188d7874a55 \
-    --hash=sha256:c17f4e0f3e6036e9f26700446f85c76ab11df65ff6d8a9cbfad9f71aabfcf23c
+virtualenv==20.26.5 \
+    --hash=sha256:4f3ac17b81fba3ce3bd6f4ead2749a72da5929c01774948e243db9ba41df4ff6 \
+    --hash=sha256:ce489cac131aa58f4b25e321d6d186171f78e6cb13fafbf32a840cee67733ff4
     # via nox
 watchdog==4.0.2 \
     --hash=sha256:0b4359067d30d5b864e09c8597b112fe0a0a59321a0f331498b013fb097406b4 \