Bump flower from 1.0.0 to 1.2.0

Bumps [flower](https://github.com/mher/flower) from 1.0.0 to 1.2.0.
- [Release notes](https://github.com/mher/flower/releases)
- [Commits](mher/flower@v1.0.0...v1.2.0)

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

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

requirements.txt

@@ -13,7 +13,7 @@ chardet==3.0.4
 click==8.0.2
 decorator==4.4.2
 Flask==1.1.2
-flower==1.0.0
+flower==1.2.0
 future==0.18.2
 google-auth==1.16.1
 humanize==0.5.1