Mark prompt_toolkit patch upstreamed

(cherry picked from commit 852ab6e)

Author: msimacek

graalpython/lib-graalpython/patches/metadata.toml

@@ -463,7 +463,9 @@ license = 'MIT'
 subdir = 'src'
 
 [[prompt_toolkit.rules]]
-# Avoid PyOS_getsig calls. Not upstreamable
+# Upstreamed
+version = '<= 3.0.51'
+install-priority = 0
 patch = 'prompt_toolkit.patch'
 license = 'BSD-3-Clause'