Fix version regex in Add-Extension

Author: shivammathur

src/scripts/extensions/add_extensions.ps1

@@ -100,7 +100,7 @@ Function Add-Extension {
     $stability = 'stable',
     [Parameter(Position = 2, Mandatory = $false)]
     [ValidateNotNull()]
-    [ValidatePattern('^\d+(\.\d+){0,2}$')]
+    [ValidatePattern('^\d+(\.\d+){0,3}$')]
     [string]
     $extension_version = ''
   )
@@ -257,4 +257,4 @@ Function Disable-AllShared() {
 # Function to handle request to add PECL.
 Function Add-Pecl() {
   Add-Log $tick "PECL" "Use extensions input to setup PECL extensions on windows"
-}
+}