build(deps): bump celery from 4.1.1 to 5.2.2 (#111)

* drop v3.6 support, celery only works in v3.7 and higher
* bumps [celery](https://github.com/celery/celery) from 4.1.1 to 5.2.2.

- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](celery/celery@v4.1.1...v5.2.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: alvaro.gonzalez <[email protected]>

.travis.yml

@@ -3,7 +3,6 @@ os:
 dist: bionic
 language: python
 python:
-  - "3.6"
   - "3.7"
   - "3.8"
   - "3.9"
@@ -52,11 +51,6 @@ jobs:
               export DOCKER_TAG=${TRAVIS_BRANCH//_/-}
               export DOCKER_TAG=${DOCKER_TAG//\//-}
           fi
-        - |
-          docker build . \
-            -f "${TRAVIS_BUILD_DIR}/docker/Dockerfile_py3.6" \
-            -t "${DOCKER_REPO_NAME}:${DOCKER_TAG}-py3.6" \
-            || travis_terminate 1
         - |
           docker build . \
             -f "${TRAVIS_BUILD_DIR}/docker/Dockerfile_py3.7" \
@@ -80,9 +74,6 @@ jobs:
         - |
           echo "${DOCKER_TOKEN}" | \
             docker login -u "${DOCKER_USER}" --password-stdin
-        - |
-          docker push "${DOCKER_REPO_NAME}:${DOCKER_TAG}-py3.6" \
-            || travis_terminate 1
         - |
           docker push "${DOCKER_REPO_NAME}:${DOCKER_TAG}-py3.7" \
             || travis_terminate 1

requirements.txt

@@ -1,5 +1,5 @@
 addict==2.2.1
-celery==4.1.1
+celery==5.2.2
 connexion==2.7.0
 Flask==1.1.2
 Flask-Cors==3.0.9