upgrade Docker client to v29

[dmke]

This was a little painful, details here: https://github.com/moby/moby/releases/tag/docker-v29.0.0

Will let this mature a little before merging/releasing.

[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.41%. Comparing base (2e1cb29) to head (4ec70bd).

Files with missing lines	Patch %	Lines
exec/docker_client.go	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   79.37%   79.41%   +0.04%     
==========================================
  Files          43       43              
  Lines        1847     1851       +4     
==========================================
+ Hits         1466     1470       +4     
  Misses        310      310              
  Partials       71       71              

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[Copilot]

Pull request overview

This PR upgrades the Docker client dependency stack to Docker/Moby v29-era packages, updating import paths and API calls to match the new client interfaces.

Changes:

• Replace github.com/docker/docker usage with github.com/moby/moby/api and github.com/moby/moby/client.
• Update Docker client calls (e.g., ContainerInspect, ImageList, ContainerCreate, ContainerWait, ContainerStart) to new option/result types.
• Refresh Go module dependencies (go.mod/go.sum) to reflect the upgraded Docker/Moby packages.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Swaps Docker dependency from github.com/docker/docker to github.com/moby/moby/{api,client} and updates indirect requirements accordingly.
go.sum	Updates checksums for the new dependency graph after the Docker/Moby v29 upgrade.
exec/docker_in_docker.go	Adjusts ContainerInspect call signature and mounts access for the new client result type.
exec/docker_in_docker_test.go	Updates mount import path to the new Moby API module.
exec/docker_client.go	Migrates Docker client construction and API calls to the new Moby client interfaces/types.
exec/docker_client_test.go	Updates mocks and tests to the new Moby client method signatures and return types.

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