chore(ci): Replace GH_CQ_BOT PAT with GitHub App tokens (#78)

Replace the non-expiring personal access token (GH_CQ_BOT) with
short-lived tokens from the cloudquery-ci GitHub App using
actions/create-github-app-token@v3.

Author: erezrokah

.github/.kodiak.toml

@@ -1,7 +1,7 @@
 version = 1
 
 [approve]
-auto_approve_usernames = ["cq-bot"]
+auto_approve_usernames = ["cloudquery-ci"]
 
 [merge.message]
 body = "pull_request_body"