Bump flower from 1.1.0 to 1.2.0

Bumps [flower](https://github.com/mher/flower) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/mher/flower/releases)
- [Commits](mher/flower@v1.1.0...v1.2.0)

---
updated-dependencies:
- dependency-name: flower
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -12,7 +12,7 @@ GitPython==3.0.8
 jsonschema==3.0.2
 deepdiff==4.0.7
 celery==5.2.2
-flower==1.1.0
+flower==1.2.0
 djangorestframework-simplejwt==4.6.0
 docopt==0.6.2
 pygments==2.7.4