Bump kombu from 4.6.3 to 4.6.7 in /requirements (from PR #438)
Bump kombu from 4.6.3 to 4.6.7 in /requirements (from PR #438)

Bumps [kombu](https://kombu.readthedocs.io) from 4.6.3 to 4.6.7.

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

glogiotatidis/basket,glogiotatidis/basket,glogiotatidis/basket