chore(webp-server): update image docker.io/webpsh/webps digest to 339b056 (#43426)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/webpsh/webps | digest | `c7d025b` -> `339b056` |

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charts/stable/webp-server/Chart.yaml

@@ -43,5 +43,5 @@ sources:
   - https://github.com/webp-sh/webp_server_go
   - https://hub.docker.com/r/webpsh/webps
 type: application
-version: 8.13.5
+version: 8.13.6
 

charts/stable/webp-server/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: docker.io/webpsh/webps
-  tag: latest@sha256:c7d025bd15687aa44cc65be8817630f42d317a22b736b8df6a3fed970e602801
+  tag: latest@sha256:339b05682e5710fa3e3481716a8a3ce61aa0f44f92d3b4361f46ba2a43aed3ba
 persistence:
   storagecache:
     enabled: true