chore(helm): update image ghcr.io/m1k1o/neko/firefox 2.8.12 → 2.8.13 (#31986)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ghcr.io/m1k1o/neko/firefox](https://redirect.github.com/m1k1o/neko) |
patch | `a6ccd71` -> `cf95cc7` |

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### Release Notes

<details>
<summary>m1k1o/neko (ghcr.io/m1k1o/neko/firefox)</summary>

###
[`v2.8.13`](https://redirect.github.com/m1k1o/neko/compare/v2.8.12...v2.8.13)

[Compare
Source](https://redirect.github.com/m1k1o/neko/compare/v2.8.12...v2.8.13)

</details>

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charts/stable/neko/Chart.yaml

@@ -6,7 +6,7 @@ annotations:
   truecharts.org/min_helm_version: "3.11"
   truecharts.org/train: stable
 apiVersion: v2
-appVersion: 2.8.12
+appVersion: 2.8.13
 dependencies:
   - name: common
     version: 25.4.10

charts/stable/neko/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: ghcr.io/m1k1o/neko/firefox
-  tag: 2.8.12@sha256:a6ccd7171db313a0ff6e7a71f577b874572f67c2bd67c4a1e6f2f1172dc6580e
+  tag: 2.8.13@sha256:cf95cc75064e9f4b30d1c7d39188c5045e326e246f3c51e04041b87d3b555462
 braveImage:
   pullPolicy: IfNotPresent
   repository: ghcr.io/m1k1o/neko/brave