(chocolatey#2801) Pin Chocolatey packages for outdated tests

Pin the chocolatey packages so that they don't inadvertently interfere
with the outdated command tests.

Author: corbob

tests/chocolatey-tests/commands/choco-outdated.Tests.ps1

@@ -4,6 +4,17 @@ Describe "choco outdated" -Tag Chocolatey, OutdatedCommand {
     BeforeAll {
         Initialize-ChocolateyTestInstall
         New-ChocolateyInstallSnapshot
+        # Pin all of the Chocolatey packages
+        @(
+            'chocolatey'
+            'chocolatey.extension'
+            'chocolatey-agent'
+            'chocolatey-management-database'
+            'chocolatey-management-service'
+            'chocolatey-management-web'
+        ) | ForEach-Object {
+            $null = Invoke-Choco pin add -n $_
+        }
         Invoke-Choco install upgradepackage --version 1.0.0 --confirm
     }