Point to spring-session tag in GitHub issue template

Issue: gh-1897

Author: eleftherias

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Community Support
-    url: https://stackoverflow.com/questions/tagged/spring-security
+    url: https://stackoverflow.com/questions/tagged/spring-session
     about: Please ask and answer questions on StackOverflow with the tag spring-session