chore(helm): update image docker.io/pepperlabs/peppermint digest to a8aac7b (#28389)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/pepperlabs/peppermint | digest | `fd4a4b7` -> `a8aac7b` |

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.

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- [ ] <!-- 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: 2.2.12
+version: 2.2.13

charts/incubator/peppermint/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/pepperlabs/peppermint
   pullPolicy: IfNotPresent
-  tag: latest@sha256:fd4a4b794d8eb8c25a46c8bd54a2f047140d0497c1d90ae1ef1ec7a9d73e0967
+  tag: latest@sha256:a8aac7b0d9a1738486fc7239e2b6960fdac9176d4e1624b32a9c8a799282dc12
 
 securityContext:
   container: