Update Checkmarx action version (#421)

Author: mandreko-bitwarden

.github/workflows/_checkmarx.yml

@@ -55,7 +55,7 @@ jobs:
         uses: bitwarden/gh-actions/azure-logout@main
 
       - name: Scan with Checkmarx
-        uses: checkmarx/ast-github-action@ef93013c95adc60160bc22060875e90800d3ecfc # 2.3.19
+        uses: checkmarx/ast-github-action@fa338ce82069b297c4852ac77e2d168db9fb56d8 # 2.3.21
         with:
           project_name: ${{ github.repository }}
           cx_tenant: ${{ steps.get-kv-secrets.outputs.CHECKMARX-TENANT }}