chore(deps): update cilium/scale-tests-action digest to 511e3d9 (v1.15)

[cilium-renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
cilium/scale-tests-action	action	digest	238d773 -> 511e3d9

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[julianwiedmann]

/test-backport-1.15