Bump tailscale/tailscale from v1.88.3 to v1.88.4

Bumps tailscale/tailscale from v1.88.3 to v1.88.4.

---
updated-dependencies:
- dependency-name: tailscale/tailscale
  dependency-version: v1.88.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -1,3 +1,3 @@
-FROM ghcr.io/tailscale/tailscale:v1.88.3
+FROM ghcr.io/tailscale/tailscale:v1.88.4
 COPY run.sh /run.sh
 CMD "/run.sh"