deps: update module github.com/moby/buildkit to v0.28.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/moby/buildkit	v0.28.0 → v0.28.1

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Release Notes

moby/buildkit (github.com/moby/buildkit)

v0.28.1

Compare Source

Welcome to the v0.28.1 release of buildkit!

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

Contributors

• Tõnis Tiigi
• CrazyMax
• Sebastiaan van Stijn

Notable Changes

• Fix insufficient validation of Git URL #ref:subdir fragments that could allow access to restricted files outside the checked-out repository root. GHSA-4vrq-3vrq-g6gg
• Fix a vulnerability where an untrusted custom frontend could cause files to be written outside the BuildKit state directory. GHSA-4c29-8rgm-jvjj
• Fix a panic when processing invalid .dockerignore patterns during COPY. #​6610 moby/patternmatcher#9

Dependency Changes

• github.com/moby/patternmatcher v0.6.0 -> v0.6.1

Previous release can be found at v0.28.0

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