ci(fix): set DOCKER_API_VERSION for skopeo on Ubuntu 24.04 runners

[DSharifi]

Fast claude code fix:

• Fix docker-launcher-build-and-verify CI job failing after runner upgrade to Ubuntu 24.04 (ci: bump buildkit and runner images versions to overcome build failure #2146)
• The skopeo package from Ubuntu 24.04 apt defaults to Docker API version 1.22, but the Docker daemon requires minimum 1.24, causing skopeo copy docker-daemon:... to fail
• Set DOCKER_API_VERSION=1.40 for the verification step to resolve the API version mismatch

Example failure:
https://github.com/near/mpc/actions/runs/22135706889/job/63986726748?pr=2144

[claude]

Review: No critical issues found.

Straightforward CI fix. Setting DOCKER_API_VERSION=1.40 for the skopeo step is the correct workaround for the Ubuntu 24.04 apt-packaged skopeo defaulting to Docker API v1.22. No concerns.

✅