Update ghcr.io/tailscale/tailscale Docker tag to v1.90.5 (#1906)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ghcr.io/tailscale/tailscale](https://tailscale.com/kb/1282/docker) ([source](https://github.com/tailscale/tailscale)) | minor | `v1.88.4` -> `v1.90.5` |

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### Release Notes

<details>
<summary>tailscale/tailscale (ghcr.io/tailscale/tailscale)</summary>

### [`v1.90.5`](https://github.com/tailscale/tailscale/compare/v1.88.4...v1.90.5)

[Compare Source](https://github.com/tailscale/tailscale/compare/v1.88.4...v1.90.5)

</details>

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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: #1906
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

hosts/ps10rp/gitea/compose.yaml

@@ -1,6 +1,6 @@
 services:
     tailscale-gitea:
-        image: ghcr.io/tailscale/tailscale:v1.88.4
+        image: ghcr.io/tailscale/tailscale:v1.90.5
         container_name: tailscale-gitea
         cap_add:
             - net_admin