Set strict mode and add shebang

Author: keeganwitt

update.ps1

@@ -1,3 +1,7 @@
+#!/usr/bin/env pwsh
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
 $groovyVersion = $(((Invoke-WebRequest "https://api.github.com/repos/apache/groovy/tags" | ConvertFrom-Json).name | Select-String -Pattern "GROOVY_4" | Select-Object -First 1).ToString().replace("GROOVY_", "").replace("_", "."))
 
 Write-Host "Updating to Groovy $groovyVersion"