Point the hookshot jira_oauth_uri deprecation at the right variable

The renamed-variable table mapped `matrix_bridge_hookshot_jira_oauth_uri` to
`..._jira_oauth_client_secret`, the entry above it. Anyone hitting the
deprecation was told to rename their setting to a variable that means something
else entirely; the URI's replacement is `..._jira_oauth_redirect_uri`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT

roles/custom/matrix-bridge-hookshot/tasks/validate_config.yml

@@ -32,7 +32,7 @@
     - {'old': 'matrix_bridge_hookshot_jira_secret', 'new': 'matrix_bridge_hookshot_jira_webhook_secret'}
     - {'old': 'matrix_bridge_hookshot_jira_oauth_id', 'new': 'matrix_bridge_hookshot_jira_oauth_client_id'}
     - {'old': 'matrix_bridge_hookshot_jira_oauth_secret', 'new': 'matrix_bridge_hookshot_jira_oauth_client_secret'}
-    - {'old': 'matrix_bridge_hookshot_jira_oauth_uri', 'new': 'matrix_bridge_hookshot_jira_oauth_client_secret'}
+    - {'old': 'matrix_bridge_hookshot_jira_oauth_uri', 'new': 'matrix_bridge_hookshot_jira_oauth_redirect_uri'}
     - {'old': 'matrix_bridge_hookshot_gitlab_secret', 'new': 'matrix_bridge_hookshot_gitlab_webhook_secret'}
     - {'old': 'matrix_bridge_hookshot_ident', 'new': 'matrix_bridge_hookshot_identifier'}
     - {'old': 'matrix_bridge_hookshot_queue_host', 'new': 'matrix_bridge_hookshot_cache_redis_host'}