Force API to create dataset version of type string

[northwestwitch]

This PR adds | fixes:

• Make sure that dataset saved into database contain a version value of type string

How to prepare for test:

• Run demo server

How to test:

• Send a request to add a dataset with version value of type int

Expected outcome:

• The dataset should be saved with type str

Review:

• Code approved by
• Tests executed by CR
• "Merge and deploy" approved by

This version is a:

• MAJOR - when you make incompatible API changes
• MINOR - when you add functionality in a backwards compatible manner
• PATCH - when you make backwards compatible bug fixes or documentation/instructions

[codecov]

Codecov Report

Merging #241 (c479d5d) into main (854817c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   95.14%   95.14%           
=======================================
  Files          56       56           
  Lines        2616     2617    +1     
=======================================
+ Hits         2489     2490    +1     
  Misses        127      127           

Flag	Coverage Δ
unittests	95.14% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
cgbeacon2/server/blueprints/api_v1/views.py	98.70% <100.00%> (+<0.01%)	⬆️

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[northwestwitch]

Tested 🆗