AdfsDsc: Fix Sampler breaking change with GitHubTasks.

[X-Guardian]

Pull Request (PR) description

This PR fixes the Sampler module breaking change issue where the GitHub tasks including Publish_release_to_GitHub have been moved to an external module Sampler.GitHubTasks in PR https://github.com/gaelcolas/Sampler/pull/240.

This Pull Request (PR) fixes the following issues

None

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [ ] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #53 (aaea786) into master (48d0c34) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #53   +/-   ##
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  Coverage      98%    98%           
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  Files          16     16           
  Lines        2080   2080           
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  Hits         2044   2044           
  Misses         36     36