Remove static analysis warning for using a module alias being referenced in a test (#414)

I generally don't like aliases being used (neither does PSScriptAnalyzer), but in this case, `New-GitHubDeploymentEnvironment` was writting to be able to behave as `Set-GitHubDeploymentEnvironment` as well, and we should be testing it the way that a user would likely be calling it.

Author: HowardWolosky

Tests/GitHubDeployments.tests.ps1

@@ -9,6 +9,8 @@
 [CmdletBinding()]
 [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '',
     Justification = 'Suppress false positives in Pester code blocks')]
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingCmdletAliases', '',
+    Justification = 'Using Set-GitHubDeploymentEnvironment the way a user would.')]
 param()
 
 Set-StrictMode -Version 1.0