Bump arq from 0.19.1 to 0.20

Bumps [arq](https://github.com/samuelcolvin/arq) from 0.19.1 to 0.20.
- [Release notes](https://github.com/samuelcolvin/arq/releases)
- [Changelog](https://github.com/samuelcolvin/arq/blob/master/HISTORY.rst)
- [Commits](python-arq/arq@v0.19.1...v0.20)

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

Author: dependabot-preview[bot]

tcsocket/requirements.txt

@@ -2,7 +2,7 @@ SQLAlchemy==1.3.23
 aiodns==2.0.0
 aiohttp==3.7.4
 aiopg==1.1.0
-arq==0.19.1
+arq==0.20
 boto3==1.17.62
 cchardet==2.1.7
 gunicorn==20.0.4