fix: Update KinD version to 0.31.0 to fix end-to-end test

The KinD 0.29.0 download URL was returning HTML instead of the binary,
causing the end-to-end test to fail with 'unexpected token <' error.
Updated to latest stable version 0.31.0 to resolve the issue.

Signed-off-by: Hijanhv <[email protected]>

Author: Hijanhv

testing/gh-actions/install_kind.sh

@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-KIND_VERSION="0.29.0"
+KIND_VERSION="0.31.0"
 KIND_URL="https://kind.sigs.k8s.io/dl/v${KIND_VERSION}/kind-linux-amd64"
 
 echo "Setting up kind environment..."