Bump uvicorn from 0.7.1 to 0.11.7 in /ml

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.7.1 to 0.11.7.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](Kludex/uvicorn@0.7.1...0.11.7)

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

Author: dependabot[bot]

ml/requirements-all.txt

@@ -75,7 +75,7 @@ starlette==0.12.0
 swagger-ui-bundle==0.0.3
 typed-ast==1.3.5
 urllib3==1.24.3
-uvicorn==0.7.1
+uvicorn==0.11.7
 uvloop==0.12.2
 websockets==7.0
 Werkzeug==0.15.4

ml/requirements-api.txt

@@ -38,4 +38,4 @@ requests==2.22.0
 starlette==0.12.0
 swagger-ui-bundle==0.0.3
 Werkzeug==0.15.4
-uvicorn==0.7.1
+uvicorn==0.11.7

ml/requirements.txt

@@ -49,4 +49,4 @@ requests==2.22.0
 starlette==0.12.0
 swagger-ui-bundle==0.0.3
 Werkzeug==0.15.4
-uvicorn==0.7.1
+uvicorn==0.11.7