Update default issue labels in snyk-template.yml

When creating an issue in GH, the labels available are O&M,Security - compliance. Snyk scan is failing because it is trying to find o&m and compliance respectively.

Author: marcos-nieto-usds

.github/workflows/snyk-template.yml

@@ -38,7 +38,7 @@ on: # yamllint disable-line rule:truthy
         description: Comma-separated labels for scan failure issues
         required: false
         type: string
-        default: "bug,o&m,compliance"
+        default: "bug,O&M,Security - compliance"
     secrets:
       SNYK_TOKEN:
         required: true