Update ghcr.io/actualbudget/actual Docker tag to v26 (#3050)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/actualbudget/actual | major | `25.12.0` → `26.1.0` |

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### Configuration

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, 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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Reviewed-on: #3050
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/actual/values.yaml

@@ -9,7 +9,7 @@ actual:
         main:
           image:
             repository: ghcr.io/actualbudget/actual
-            tag: 25.12.0
+            tag: 26.1.0
             pullPolicy: IfNotPresent
           env:
             - name: TZ