Bump amqp from 2.5.1 to 2.5.2

Bumps [amqp](https://github.com/celery/py-amqp) from 2.5.1 to 2.5.2.
- [Release notes](https://github.com/celery/py-amqp/releases)
- [Changelog](https://github.com/celery/py-amqp/blob/master/Changelog)
- [Commits](celery/py-amqp@2.5.1...2.5.2)

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

requirements.txt

@@ -6,7 +6,7 @@ psycopg2==2.8.4
 Django==1.11.26
 
 # Other
-amqp==2.5.1
+amqp==2.5.2
 pyyaml>=4.2b1
 beautifulsoup4==4.8.1
 httplib2<0.14.1