Update contact link name for clarity on PCD 2026 forum thread

Author: SableRaf

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Call for Organizers (forum thread)
+  - name: PCD 2026 forum thread
     url: https://discourse.processing.org/t/pcd-worldwide-2026/48081
     about: General questions and discussion for PCD 2026 organizers