Bump pydantic[email] from 1.5.1 to 1.8.1

Bumps [pydantic[email]](https://github.com/samuelcolvin/pydantic) from 1.5.1 to 1.8.1.
- [Release notes](https://github.com/samuelcolvin/pydantic/releases)
- [Changelog](https://github.com/samuelcolvin/pydantic/blob/master/HISTORY.md)
- [Commits](pydantic/pydantic@v1.5.1...v1.8.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

tcsocket/requirements.txt

@@ -8,7 +8,7 @@ cchardet==2.1.7
 gunicorn==20.0.4
 python-dateutil==2.8.1
 pillow==8.1.2
-pydantic[email]==1.5.1
+pydantic[email]==1.8.1
 raven==6.10.0
 requests==2.24.0
 uvloop==0.15.2