Fix enum string types in openapi spec

[studiosciences]

Problem

type: enum is not valid in OpenAPI specs.
https://spec.openapis.org/oas/v3.1.0#data-types

Closes: #2085

Solution

It's suppose to be a type: string with of enum values.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've updated the CHANGELOG.md with details about your change under the "Unreleased" section (if relevant, depending on the change, this may not be necessary)
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[wslulciuc]

Thanks, @studiosciences! 💯

[codecov]

Codecov Report

Merging #2086 (bd6b89a) into main (7da23da) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2086   +/-   ##
=========================================
  Coverage     77.04%   77.04%           
  Complexity     1013     1013           
=========================================
  Files           201      201           
  Lines          4643     4643           
  Branches        389      389           
=========================================
  Hits           3577     3577           
  Misses          628      628           
  Partials        438      438           

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