Update mongo Docker tag to v7.0.15 (#229)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| mongo | Component | patch | `7.0.14` -> `7.0.15` |

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kustomization/components/unifi-network-application/kustomization.yml

@@ -13,7 +13,7 @@ images:
   - name: lscr.io/linuxserver/unifi-network-application
     newTag: 8.1.127
   - name: mongo
-    newTag: 7.0.14
+    newTag: 7.0.15
 resources:
   - statefulset.yml
   - serverstransport.yml