Remove support for Windows 1803

Pedro Pombeirorequested to merge
6553-remove-win1803 into master

What does this MR do?

Removes support for Windows 1803.

Why was this MR needed?

See #6553 (closed)

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Added tests for this feature/bug
  • In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Closes #6553 (closed)

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