Hard-lock Pester test dependency to 5.8.0 by GUID

Author: MariusStorhaug

tests/PSCustomObject.Tests.ps1

@@ -1,4 +1,6 @@
-[Diagnostics.CodeAnalysis.SuppressMessageAttribute(
+#Requires -Modules @{ ModuleName = 'Pester'; RequiredVersion = '5.8.0'; GUID = 'a699dea5-2c73-4616-a270-1f7abb777e71' }
+
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute(
     'PSUseDeclaredVarsMoreThanAssignments', '',
     Justification = 'Pester grouping syntax: known issue.'
 )]