Change asdf-pandoc to be maintained by StephanMeijer

asdf-pandoc does not seem to have been claimed as community repository. I would like to do so so that I can work on my changes as a community effort.

terraform/github/teams.tf

@@ -341,7 +341,7 @@ locals {
     asdf-pandoc = {
       description = "The people with push access to the asdf-pandoc repository",
       maintainers = [
-        "sys9kdr",
+        "StephanMeijer",
       ]
     }