fix(robot-server): fix typing_extensions bug

[iansolano]

fix typing_extensions bug by removing Literal type and subsequently the library

closes #5275

overview

See here: #5275

Introduced a bug when importing Literal type from typing_extensions which is only used in development. Python 3.8 supports Literal types, so we can revert changes at a later date.

changelog

review requests

risk assessment

[codecov]

Codecov Report

Merging #5281 into edge will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             edge    #5281   +/-   ##
=======================================
  Coverage   61.80%   61.81%           
=======================================
  Files        1049     1050    +1     
  Lines       29926    29933    +7     
=======================================
+ Hits        18497    18504    +7     
  Misses      11429    11429           

Impacted Files	Coverage Δ
...r/robot_server/service/models/json_api/__init__.py	100.00% <100.00%> (ø)
...er/robot_server/service/models/json_api/factory.py	100.00% <100.00%> (ø)
...er/robot_server/service/models/json_api/request.py	100.00% <100.00%> (ø)
...r/robot_server/service/models/json_api/response.py	100.00% <100.00%> (ø)
robot-server/robot_server/service/routers/item.py	79.31% <100.00%> (+0.73%)	⬆️

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[sfoster1]

it does boot now!