xSQLServer: Quick fix for breaking changes in Pester

[johlju]

Pull Request (PR) description

• Changes to xSQLServer
  • Changed so the maximum version to be installed is 4.0.6.0. Quick fix until we
    can resolve the unit tests (see issue xSQLServer: New version 4.0.7 of Pester will break unit tests #807).

This Pull Request (PR) fixes the following issues:
This does not fix the issue - just a workaround until we fix the problems in the unit tests.

Task list:

• Change details added to Unreleased section of CHANGELOG.md?
• Added/updated documentation, comment-based help and descriptions in .schema.mof files where appropriate?
• Examples appropriately updated?
• New/changed code adheres to Style Guidelines?
• Unit and (optional) Integration tests created/updated where possible?

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This change is 

[johlju]

I will merge this as soon as the tests passes.

[codecov-io]

Codecov Report

Merging #813 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##            dev   #813   +/-   ##
===================================
  Coverage    96%    96%           
===================================
  Files        30     30           
  Lines      3259   3259           
===================================
  Hits       3142   3142           
  Misses      117    117

[johlju]

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Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable