chore: bump cfsign chart to version 1.8.21 (#387)

Author: vasil-cf

charts/codefresh/Chart.yaml

@@ -108,7 +108,7 @@ dependencies:
     repository: oci://quay.io/codefresh/charts
     condition: charts-manager.enabled
   - name: cfsign
-    version: 1.8.20
+    version: 1.8.21
     repository: oci://quay.io/codefresh/charts
     condition: cfsign.enabled
   - name: tasker-kubernetes