chore(helm): update image docker.io/pepperlabs/peppermint digest to f8444ee (#28133)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/pepperlabs/peppermint | digest | `992926c` -> `f8444ee` |

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

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charts/incubator/peppermint/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/incubator/peppermint
   - https://hub.docker.com/r/pepperlabs/peppermint
 type: application
-version: 2.2.8
+version: 2.2.9

charts/incubator/peppermint/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/pepperlabs/peppermint
   pullPolicy: IfNotPresent
-  tag: latest@sha256:992926c3c7468ec9662ee726de1e51205d28253fed4edeefaea0a40cb7f7d4f2
+  tag: latest@sha256:f8444ee3231c1dc490376d6e1de46b49cc5fe00b27f4ac9b06deeeffd370ca5e
 
 securityContext:
   container: