Update tailscale/tailscale Docker tag to v1.68.1

Author: renovate-bot

tailscale/Dockerfile

@@ -5,7 +5,7 @@
 # https://tailscale.com/kb/1241/tailscale-up
 # https://tailscale.com/kb/1242/tailscale-serve
 # https://tailscale.com/kb/1311/tailscale-funnel
-FROM tailscale/tailscale:v1.66.4@sha256:8c80cf92bfbc6938d05826b1aee899e629b231cecf7921bd1d72a4150e71e3f3
+FROM tailscale/tailscale:v1.68.1@sha256:a0d1a9ed2abfacf905c0e3423aea00181064162e548f875f422a03924b9cc5c4
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh