Update bug_report.yaml (#5129)

Author: nibanks

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -34,10 +34,9 @@ body:
       description: On what version of MsQuic does this bug occur? Please select the affected code branch from the drop-down menu.
       options:
         - main
+        - v2.5
+        - v2.4
         - v2.3
-        - v2.2
-        - v2.1
-        - v2.0
         - Older
   - type: textarea
     validations: