Upgrade versions where possible

[codecov-io]

Codecov Report

Merging #120 into master will decrease coverage by 0.24%. The diff coverage is 70.68%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
- Coverage   65.61%   65.37%   -0.25%     
==========================================
  Files         153      153              
  Lines        5590     5606      +16     
  Branches      517      518       +1     
==========================================
- Hits         3668     3665       -3     
- Misses       1822     1836      +14     
- Partials      100      105       +5

Impacted Files	Coverage Δ
src/zsl/contrib/alembic/alembic_module.py	0% <0%> (ø)	:arrow_up:
src/zsl/tasks/zsl/schedule_gearman_task.py	0% <0%> (ø)	:arrow_up:
src/zsl/utils/cache_helper.py	24.78% <0%> (ø)	:arrow_up:
src/zsl/tasks/zsl/sum_task.py	0% <0%> (ø)	:arrow_up:
src/zsl/tasks/zsl/schedule_celery_task.py	0% <0%> (ø)	:arrow_up:
src/zsl/testing/zsl.py	85.71% <100%> (+1.09%)	:arrow_up:
tests/task_decorators/secured_task_test.py	100% <100%> (ø)	:arrow_up:
src/zsl/task/job_context.py	92.4% <100%> (ø)	:arrow_up:
tests/utils/command_dispatcher_test.py	95.08% <100%> (ø)	:arrow_up:
tests/interface/cli/exec_task_from_cli_test.py	100% <100%> (ø)	:arrow_up:
... and 25 more

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[JankesJanco]

Although the image was build successfully, I've encountered this error during building Docker image from docker/Dockerfile.

ERROR: flask 1.1.1 has requirement Werkzeug>=0.15, but you'll have werkzeug 0.14 which is incompatible.

[babky]

Although the image was build successfully, I've encountered this error during building Docker image from docker/Dockerfile.

ERROR: flask 1.1.1 has requirement Werkzeug>=0.15, but you'll have werkzeug 0.14 which is incompatible.

However - this uses fixed/old zsl...