feat(argo-workflows): Bump appVersion to 3.1.8 (#879)

Co-authored-by: David J. M. Karlsen <david@davidkarlsen.com>

charts/argo-workflows/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: argo-workflows
 description: A Helm chart for Argo Workflows
 type: application
-version: 0.4.1
-appVersion: "v3.1.5"
+version: 0.4.2
+appVersion: "v3.1.8"
 icon: https://raw.githubusercontent.com/argoproj/argo-workflows/master/docs/assets/argo.png
 home: https://github.com/argoproj/argo-helm
 sources:
@@ -15,4 +15,4 @@ maintainers:
   - name: benjaminws
 annotations:
   artifacthub.io/changes: |
-    - "[Fixed]: Fix typos in Workflows RBAC settings"
+    - "[Changed]: Bump appVersion to 3.1.8"