fix(deps): drop vulnerable docker/docker via bufbuild/buf v1.70.0

[PatrykMilewski]

Summary

Resolves all 3 open HIGH Dependabot alerts. Before -> after: 3 high -> 0 high, 0 critical (unchanged), 0 moderate/low (none open).

All three alerts are rooted in the transitive github.com/docker/docker dependency, which is pulled in only through the tool directive github.com/bufbuild/buf/cmd/buf (protobuf codegen) — it is never linked into the threshold-signature library. govulncheck confirms zero reachable vulnerabilities both before and after.

GHSA	Severity	Summary	Vulnerable range / patch
GHSA-rg2x-37c3-w2rh	HIGH	docker cp race → bind-mount redirection to host path	<= 28.5.2, no patch on legacy path
GHSA-x86f-5xw2-fm2r	HIGH	PUT /containers/{id}/archive executes container binary on host	<= 28.5.2, no patch on legacy path
GHSA-x744-4wpc-v9h2	HIGH	Moby AuthZ plugin bypass on oversized request bodies	patched 29.3.1

Why a buf bump (not a docker/docker bump)

The legacy github.com/docker/docker +incompatible module path tops out at v28.5.2 — the fixed 29.x line was published only on the new github.com/moby/moby module path, so the vulnerable module cannot be patched in place. buf v1.56.0 still depended on docker/docker; buf v1.70.0 migrated to github.com/moby/moby/api + .../client, removing github.com/docker/docker (and docker/cli, docker/distribution) from the module graph entirely.

Changes

• github.com/bufbuild/buf v1.56.0 → v1.70.0 (indirect, tool directive) and its transitive deps.
• github.com/docker/docker removed from go.mod/go.sum (0 references remaining).
• go directive 1.25.0 → 1.25.10 (buf v1.70.0 minimum), under the existing toolchain go1.25.11.
• No source changes — go.mod/go.sum only. No cryptographic behavior is touched.

Breaking changes

None for consumers of this library. The only direct-dependency surface change is the go directive minimum (1.25.0 → 1.25.10); all changes are build-time/tooling-only (buf codegen path) and docker/docker was never in the import graph of the signing code.

Verification

• go build ./... — passes
• make test_ci (go test -failfast -race -timeout 60m, fresh keygen/resharing fixtures regenerated) — all packages pass, no data races
• govulncheck ./... — "No vulnerabilities found"

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📥 Commits

Reviewing files that changed from the base of the PR and between 576cc80 and bc1716d.

⛔ Files ignored due to path filters (1)

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📒 Files selected for processing (1)

• go.mod

✨ Finishing Touches

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• Commit unit tests in branch fix/dependabot-docker-highs

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[fabian-dios]

Approved — verified this PR contains only dependency changes (go.mod/go.sum) remediating the cited Dependabot advisories, with no source-code modifications.