chore(deps): update container image mattermost/mattermost-enterprise-edition to release-9.6@2e17ce8 by renovate (#21177)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| mattermost/mattermost-enterprise-edition | digest | `8fa3292` ->
`2e17ce8` |

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This PR has been generated by [Renovate
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<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zMTguMCIsInVwZGF0ZWRJblZlciI6IjM3LjMxOC4wIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInVwZGF0ZS9kb2NrZXIvZ2VuZXJhbC9ub24tbWFqb3IiXX0=-->

charts/stable/mattermost/Chart.yaml

@@ -36,4 +36,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/mattermost
   - https://hub.docker.com/r/mattermost/mattermost-enterprise-edition
 type: application
-version: 12.9.14
+version: 12.9.15

charts/stable/mattermost/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: mattermost/mattermost-enterprise-edition
-  tag: release-9.6@sha256:8fa3292e687c5dd7a7a9907f63bd1b57ed6280551be62f5f7147fa54e3120d5a
+  tag: release-9.6@sha256:2e17ce852708935bc28fc9275579c1d4e9a50604a6fb02d0b27515606b521b9b
   pullPolicy: IfNotPresent
 workload:
   main: