test: update github ref used on e2e oncluster tests · knative/func@dd14ebc

Failed to download action 'https://api.github.com/repos/actions/checkout/tarball/c85c95e3d7251135ab7dc9ce3241c5835cc595a9'. Error: Response status code does not indicate success: 503 (Service Unavailable).

Back off 19.553 seconds before retry.

Restore cache failed: Dependencies file is not found in /home/runner/work/func/func. Supported file pattern: go.sum