chore(webp-server): update image docker.io/webpsh/webps digest to 8ffd295 (#44699)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/webpsh/webps | digest | `339b056` → `8ffd295` |

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charts/stable/webp-server/Chart.yaml

@@ -46,5 +46,5 @@ sources:
   - https://github.com/webp-sh/webp_server_go
   - https://hub.docker.com/r/webpsh/webps
 type: application
-version: 8.13.17
+version: 8.13.18
 

charts/stable/webp-server/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: docker.io/webpsh/webps
-  tag: latest@sha256:339b05682e5710fa3e3481716a8a3ce61aa0f44f92d3b4361f46ba2a43aed3ba
+  tag: latest@sha256:8ffd2958bf149f7d191b888f4c448c4bdf1a0b24e7b304908921e863d8098103
 persistence:
   storagecache:
     enabled: true