build(deps): bump tenacity from 6.2.0 to 6.3.1 in /bot (#711)

Bumps [tenacity](https://github.com/jd/tenacity) from 6.2.0 to 6.3.1.
- [Release notes](https://github.com/jd/tenacity/releases)
- [Commits](jd/tenacity@6.2.0...6.3.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

bot/requirements.txt

@@ -4,6 +4,6 @@ libmozdata==0.1.68
 pytoml==0.1.21
 pytz==2020.4
 pyyaml==5.3.1
-tenacity==6.2.0
+tenacity==6.3.1
 tqdm==4.54.1
 zstandard==0.14.1