🐛 Update cloudflared version in examples

**Describe the bug**

The version in the example provided for deploying cloudflared on k8s is [cloudflare/cloudflared:2021.5.10](https://github.com/cloudflare/argo-tunnel-examples/blob/master/terraform-gcp-gke-ingress-controller/k8s-cloudflared.tf#L47C20-L47C42) while the latest released version at time of writing is `2025.2.1` this represents a 4 year gap which is against Cloudlare's stated policy of 1 year support rendering the example stale and possibly non usable.

**Expected behavior**
Please review the examples and update the versioning used, or build an automated process to push version updates into example code.