WIP: ⬆️ vulnerability upgrade ujson -> fastapi

[pcrespov]

What do these changes do?

CVE-2021-45958
High severity
Vulnerable versions: >= 4.0.2, < 5.1.0
Patched version: 5.1.0
UltraJSON (aka ujson) 4.0.2 through 5.0.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode).

• cannot upgrade all repo due to constraints in fastapi.
• Waiting for fastapi to upgrade constraint on ujson (https://github.com/tiangolo/fastapi/blob/master/pyproject.toml#L62)
• cleanup reqs comments

Related issue/s

CVE-2021-45958

How to test

all tests shall pass

Checklist

• upgrade repo-wide fastapi when ujson constraint is removed
• Openapi changes? make openapi-specs, git commit ... and then make version-*)
• Database migration script? cd packages/postgres-database, make setup-commit, sc-pg review -m "my changes"
• Unit tests for the changes exist
• Runs in the swarm
• Documentation reflects the changes
• New module? Add your github username to .github/CODEOWNERS
  -->

[codecov]

Codecov Report

Merging #2762 (6378b14) into master (cf7791f) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2762   +/-   ##
======================================
  Coverage    78.8%   78.8%           
======================================
  Files         680     680           
  Lines       27101   27101           
  Branches     2633    2633           
======================================
+ Hits        21362   21370    +8     
+ Misses       4995    4988    -7     
+ Partials      744     743    -1     

Flag	Coverage Δ
integrationtests	65.8% <ø> (+<0.1%)	⬆️
unittests	74.4% <ø> (+<0.1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../director/src/simcore_service_director/producer.py	62.6% <0.0%> (+0.8%)	⬆️
...ector_v2/modules/comp_scheduler/background_task.py	86.2% <0.0%> (+7.8%)	⬆️

[pcrespov]

Too many conflicts. worth re-doing