chore(release): prepare 5.0.0-rc8

Set the prerelease label to rc8 and add 5.0.0-rc7, which the PowerShell
Gallery has had since 2026-10-10, to the versions that the Gallery has
(Docs/Contributing/05-Releasing.md).

A separate commit, so that it can be dropped if the changes of this branch
go into another prerelease instead.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: AI Assistant <ai@example.com>

NTFSSecurity/NTFSSecurity.psd1

@@ -102,7 +102,7 @@
             ProjectUri   = 'https://github.com/raandree/NTFSSecurity'
             ReleaseNotes = 'https://github.com/raandree/NTFSSecurity/blob/master/CHANGELOG.md'
             # Remove the prerelease label for the final release, see Docs/Contributing/05-Releasing.md
-            Prerelease   = 'rc7'
+            Prerelease   = 'rc8'
         }
     }
 }

Tests/Repository.Tests.ps1

@@ -97,7 +97,7 @@ Describe 'Release metadata' {
     # The PowerShell Gallery doesn't accept a version twice. Add every published version to this list
     # (Docs/Contributing/05-Releasing.md).
     It 'Should not reuse a version that the PowerShell Gallery already has' {
-        $publishedVersions = '4.0', '4.2.2', '4.2.3', '4.2.4', '4.2.5', '4.2.6', '5.0.0-rc1', '5.0.0-rc2', '5.0.0-rc3', '5.0.0-rc4', '5.0.0-rc5', '5.0.0-rc6'
+        $publishedVersions = '4.0', '4.2.2', '4.2.3', '4.2.4', '4.2.5', '4.2.6', '5.0.0-rc1', '5.0.0-rc2', '5.0.0-rc3', '5.0.0-rc4', '5.0.0-rc5', '5.0.0-rc6', '5.0.0-rc7'
 
         $publishedVersions | Should -Not -Contain $version
     }