refactor: Add severity dropdown to bug report template

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -40,6 +40,7 @@ body:
         - High
         - Critical
         - Enhancement
+      multiple: true
     validations:
       required: true
 

.github/workflows/issue-create.yml

@@ -32,4 +32,7 @@ jobs:
         with:
           issue-form: ${{ steps.issue-parser.outputs.jsonString }}
           token: ${{ secrets.GITHUB_TOKEN }}
-          section: severity
+          section: severity
+          block-list: |  # <-- this value needs to be set (workaround)
+            None
+