Bump kombu from 4.6.1 to 4.6.3 (#5071)

Bumps [kombu](https://kombu.readthedocs.io) from 4.6.1 to 4.6.3.

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

requirements/common.txt

@@ -45,7 +45,7 @@ Django==2.2.2 \
 
 celery==4.3.0 --hash=sha256:528e56767ae7e43a16cfef24ee1062491f5754368d38fcfffa861cdb9ef219be --hash=sha256:4c4532aa683f170f40bd76f928b70bc06ff171a959e06e71bf35f2f9d6031ef9
 
-kombu==4.6.1 --hash=sha256:056a31cc95b10ca4eb0d4ebcba714007b1db1c6c45c8e2d139fe91933481b00b --hash=sha256:af5b0f892b081f49d95c772a241fb7687f4cc3e42c94328f118dffb1f4e161e5
+kombu==4.6.3 --hash=sha256:55b71d3785def3470a16217fe0780f9e6f95e61bf9ad39ef8dce0177224eab77 --hash=sha256:eb365ea795cd7e629ba2f1f398e0c3ba354b91ef4de225ffdf6ab45fdfc7d581
 
 simplejson==3.16.0 \
     --hash=sha256:6c3258ffff58712818a233b9737fe4be943d306c40cf63d14ddc82ba563f483a \