dep: upgrade upstream to v3.2.6

https://github.com/tailwindlabs/tailwindcss/releases/tag/v3.2.6

Author: flavorjones

lib/tailwindcss/upstream.rb

@@ -1,7 +1,7 @@
 module Tailwindcss
   # constants describing the upstream tailwindcss project
   module Upstream
-    VERSION = "v3.2.4"
+    VERSION = "v3.2.6"
 
     # rubygems platform name => upstream release filename
     NATIVE_PLATFORMS = {