build(deps): bump tenacity from 6.3.1 to 7.0.0 in /bot

Bumps [tenacity](https://github.com/jd/tenacity) from 6.3.1 to 7.0.0.
- [Release notes](https://github.com/jd/tenacity/releases)
- [Commits](jd/tenacity@6.3.1...7.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

bot/requirements.txt

@@ -4,6 +4,6 @@ libmozdata==0.1.70
 pytoml==0.1.21
 pytz==2020.5
 pyyaml==5.4.1
-tenacity==6.3.1
+tenacity==7.0.0
 tqdm==4.59.0
 zstandard==0.15.2