Bump wolfi/chainguard-base

[LikeTheSalad]

Supersedes #4399
Co-authored by Cursor

Bump chainguard-base image digest, testcontainers to 1.21.4, and upgrade ES test image from 7.17.2 to 7.17.25 to fix cgroupv2 container startup failures on CI runners.

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[LikeTheSalad]

The failed "Non-Application Server integration tests" seems to be failing because it cannot find Docker? Given:
Could not find a valid Docker environment.

It seems like this issue is happening in the main branch too: https://github.com/elastic/apm-agent-java/actions/runs/22088228325 - Is this a known, expected issue? @SylvainJuge @jackshirazi

[SylvainJuge]

What I know is that the "missing docker" message below should be fixed with testcontainers update:

2026-02-17 06:33:08,102 [main] ERROR org.testcontainers.dockerclient.DockerClientProviderStrategy - Could not find a valid Docker environment. Please check configuration. Attempted configurations were:
	UnixSocketClientProviderStrategy: failed with exception BadRequestException (Status 400: {"message":"client version 1.32 is too old. Minimum supported API version is 1.44, please upgrade your client to a newer version"}

For the ES server, I don't remember exactly but I also got very similar suggestions by copilot to fix it, I haven't been able to validate if it's relevant though.