chore(helm): update image docker.io/linuxserver/mylar3 digest to 81c7ad5 (#28687)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/linuxserver/mylar3 | digest | `dda666d` -> `81c7ad5` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

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

---

### 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

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC4xNDEuMSIsInVwZGF0ZWRJblZlciI6IjM4LjE0MS4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/mylar/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/mylar
   - https://hub.docker.com/r/linuxserver/mylar3
 type: application
-version: 15.2.5
+version: 15.2.6

charts/stable/mylar/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: docker.io/linuxserver/mylar3
-  tag: version-v0.8.0@sha256:dda666da7e76d3acaf74a6ea500baf2ce247ece94dd8f80bdb95d89aa805fa84
+  tag: version-v0.8.0@sha256:81c7ad59fbb10fe7dc440e4d23ce2914b28ade4319f866b2fe88644a1c6b3b0c
   pullPolicy: IfNotPresent
 service:
   main: