chore(deps): update container image ich777/steamcmd to cs2@15f6451 by renovate (#26490)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ich777/steamcmd | digest | `8c6d968` -> `15f6451` |

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> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
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charts/stable/cs2/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/cs2
   - https://hub.docker.com/r/ich777/steamcmd
 type: application
-version: 5.1.7
+version: 5.1.8

charts/stable/cs2/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: ich777/steamcmd
   pullPolicy: IfNotPresent
-  tag: cs2@sha256:8c6d968a6e06cba3a55dc20236bf8896e49abf7036b3b98863114a822d53ed84
+  tag: cs2@sha256:15f64517c2783293415f64c35b0ebb39a00fc40ef671a9c37207fcbb63e2a1f0
 
 securityContext:
   container: