Skip publisher check for pester

> The built-in version is signed by Microsoft while newer versions are community-maintained and signed with a different certificate, causing Install-Module to sometimes throw a error requiring us to accept the new publisher certificate.
source: https://pester.dev/docs/introduction/installation#windows

.github/workflows/ci.yml

@@ -322,7 +322,7 @@ jobs:
       run: |
         $PSVersionTable
         Set-PSRepository psgallery -InstallationPolicy trusted
-        Install-Module -Name Pester -RequiredVersion 5.3.1 -Confirm:$false -Force
+        Install-Module -Name Pester -RequiredVersion 5.3.1 -Confirm:$false -Force -SkipPublisherCheck
         $Error.clear()
         Invoke-Pester -Path "tests" -CI
         if ($Error.Length -gt 0) {exit 1}