Bump tailscale/tailscale from v1.78.1 to v1.80.3 in /sidecar

Bumps tailscale/tailscale from v1.78.1 to v1.80.3.

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

sidecar/Dockerfile

@@ -1,3 +1,3 @@
-FROM tailscale/tailscale:v1.78.1
+FROM tailscale/tailscale:v1.80.3
 COPY connect.sh /connect.sh
 CMD "/connect.sh"