chore(deps): update dependency docker/buildx to v0.21.0

[renovate]

This PR contains the following updates:

Package	Update	Change
docker/buildx	minor	0.20.1 -> 0.21.0

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Release Notes

docker/buildx (docker/buildx)

v0.21.0

Compare Source

buildx 0.21.0

Welcome to the v0.21.0 release of buildx!

Please try out the release binaries and report any issues at
https://github.com/docker/buildx/issues.

Contributors

• CrazyMax
• Tõnis Tiigi
• Sebastiaan van Stijn
• Jonathan A. Sternberg
• David Karlsson
• Nicolas De Loof

Notable Changes

• New command buildx history trace allows inspecting traces of a build in a Jaeger UI-based viewer and comparing one trace with another. #​2904
• The history inspection command buildx history inspect now supports custom formatting with --format flag and JSON formatting for machine-readable output. #​2964
• Supported CDI devices are now shown in the builder inspection. #​2983
• When using Github Cache backend type=gha, the URL for the Version 2 or API is now read from the environment and sent to BuildKit. Version 2 backend requires BuildKit v0.20.0 or later. #​2983
• Avoid unnecessary warnings and prompts when using --progress=rawjson #​2957
• Fix regression with debug shell sometimes not working correctly on --on=error #​2958
• Fix possible panic errors when using an unknown variable in the Bake definition. #​2960
• Fix invalid duplicate output on JSON format formatting of buildx ls command. #​2970
• Fix bake handling cache imports with CSV string containing multiple registry references. #​2944
• Fix issue where error from pulling BuildKit image could be ignored #​2988

Dependency Changes

• github.com/Azure/go-ansiterm d185dfc -> faa5f7b
• github.com/docker/cli v27.5.0 -> v28.0.0-rc.2
• github.com/docker/docker v27.5.0 -> v28.0.0-rc.2
• github.com/moby/buildkit v0.19.0 -> v0.20.0
• github.com/moby/term v0.5.0 -> v0.5.2
• github.com/tonistiigi/jaeger-ui-rest 7d4944a new
• go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.31.0 new
• golang.org/x/exp 701f63a -> 2d47ceb
• golang.org/x/mod v0.21.0 -> v0.22.0
• golang.org/x/sys v0.28.0 -> v0.29.0
• golang.org/x/tools v0.25.0 -> v0.27.0
• google.golang.org/genproto/googleapis/api 5fefd90 -> 324edc3
• google.golang.org/grpc v1.68.1 -> v1.69.4

Previous release can be found at v0.20.1

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