DnsRecordPtr: IPv6 hot fix

[Sudman1]

Pull Request (PR) description

Fixed logic bug in expanding IPv6 addresses used to detect the reverse lookup zone name.

This Pull Request (PR) fixes the following issues

• Fixes #255

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.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #256 (c40c577) into main (b17d68f) will increase coverage by 0%. The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #256   +/-   ##
===================================
  Coverage    91%    91%           
===================================
  Files        38     38           
  Lines      1546   1550    +4     
===================================
+ Hits       1407   1411    +4     
  Misses      139    139           

Impacted Files	Coverage Δ
source/Classes/002.DnsRecordPtr.ps1	100% <100%> (ø)

[johlju]

The tests could have used test cases instead of a foreach (foreach could have built the test case instead). But we can keep it as is and fix it for Pester 5 in the future.

[johlju]

So just that tiny fix and it will be ready to merge. 😄