security: bump golang.org/x/mod to fix CVE-2026-56864/56865 - #538
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Trivy's vulnerability DB started flagging the transitive x/mod v0.37.0 dependency (pulled in via pkg/plugin -> sigstore-go) as HIGH, failing the Security Scan check on every open PR regardless of what changed. Bump to v0.40.0, the fixed version.
Same CVE-2026-56864/56865 fix as the root module, missed on the first pass because lambda/ttl-reaper pins its own go.mod (a separate Go module with a replace directive to ../.., per this repo's structure) and isn't touched by `go mod tidy` at the repo root. This is exactly the "nested module pins its own deps" trap noted for lagotto#43 — a stale go.mod in a nested lambda module fails CI without naming which module.
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Trivy's vulnerability DB started flagging the transitive
golang.org/x/mod v0.37.0dependency (pulled in viapkg/plugin-> sigstore-go's module-verification code) as HIGH severity for CVE-2026-56864/CVE-2026-56865 — a malicious GOSUMDB/GOPROXY could forge module checksums. This started failing the Security Scan check on every open PR in this repo regardless of what the PR actually changed, since it's a scan of the dependency graph onmain, not a diff.Bumped to v0.40.0 (the fixed version) via
go get golang.org/x/mod@v0.40.0 && go mod tidy. No other dependency changed.go build ./...,go vet ./..., andgo test -short ./...all clean.