chore(deps): update dependency pg8000 to v1.21.2 (#163)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pg8000](https://togithub.com/tlocke/pg8000) | `==1.21.1` -> `==1.21.2` | [![age](https://badges.renovateapi.com/packages/pypi/pg8000/1.21.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/pg8000/1.21.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/pg8000/1.21.2/compatibility-slim/1.21.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/pg8000/1.21.2/confidence-slim/1.21.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>tlocke/pg8000</summary>

### [`v1.21.2`](https://togithub.com/tlocke/pg8000/compare/1.21.1...1.21.2)

[Compare Source](https://togithub.com/tlocke/pg8000/compare/1.21.1...1.21.2)

</details>

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requirements.txt

@@ -1,7 +1,7 @@
 aiohttp==3.7.4.post0
 cryptography==3.4.8
 PyMySQL==1.0.2
-pg8000==1.21.1
+pg8000==1.21.2
 python-tds==1.11.0
 pyopenssl==20.0.1
 Requests==2.26.0

setup.py

@@ -78,7 +78,7 @@
     install_requires=core_dependencies,
     extras_require={
         "pymysql": ["PyMySQL==1.0.2"],
-        "pg8000": ["pg8000==1.21.1"],
+        "pg8000": ["pg8000==1.21.2"],
         "pytds": ["python-tds==1.11.0"]
     },
     python_requires=">=3.6",