fix(build): update k8s-staging-test-infra image in integ tests

[sambhav-jain-16]

Integration tests github action is failing due to the following error

Unable to find image 'gcr.io/k8s-staging-test-infra/bootstrap:v20250702-52f5173c3a' locally
docker: Error response from daemon: manifest for gcr.io/k8s-staging-test-infra/bootstrap:v20250702-52f5173c3a not found: manifest unknown: Failed to fetch "v20250702-52f5173c3a"

This PR aims to update the image to fix the failures

[sambhav-jain-16]

@dims looks like there's a regression in the new image, the integ tests are failing. Can you tell me the source of the image?
I'll debug what is happening

[sambhav-jain-16]

Took some help from agents

The new bootstrap image ships a newer version of Docker Engine and runc (the low-level container runtime). When you pass --cpu-shares 2048 to Docker on a cgroupv2 system, runc converts that value to cgroupv2's native cpu.weight format. The old runc used a simple linear formula https://github.com/opencontainers/runc/blob/d11f4d756e85ece5cdba8bb69f8bd4db3cdcbeab/libcontainer/cgroups/utils.go#L423-L428: weight = 1 + ((shares-2) * 9999) / 262142) which gives
cpu.weight = 79 for --cpu-shares 2048. Starting with runc v1.3.2, runc switched to using the opencontainers/cgroups package which replaced this with a logarithmic formula https://github.com/opencontainers/cgroups/blob/main/utils.go#L455-L470: weight = ceil(10^((log₂(shares)² + 125·log₂(shares))/612 - 7/34))), producing cpu.weight = 174 for the same input. cAdvisor's convertCPUWeightToCPULimit function was written to invert the old linear formula and hasn't been updated, so when it reads 174 and applies the old inverse, it computes 4537 instead of the expected 2046.

Sources:

• https://github.com/opencontainers/runc/blob/d11f4d756e85ece5cdba8bb69f8bd4db3cdcbeab/libcontainer/cgroups/utils.go#L
  423-L428
• https://github.com/opencontainers/cgroups/blob/main/utils.go#L455-L470
• ConvertCPUSharesToCgroupV2Value: improve opencontainers/cgroups#20
• container_spec_cpu_shares will use wrong cgroups v2 conversion formula for runc v1.3.2+ #3737

[sambhav-jain-16]

I have decided to fix the test to unblock rather than the actual code based on this comment.
If you feel we should fix the code, then LMK