fix(conformance): tidy Go adapter deps for local SDK

[figtracer]

Fixes the Go SDK conformance adapter setup for SDK PRs that change transitive dependencies.

The reusable SDK conformance workflow edits the Go adapter to replace github.com/tempoxyz/mpp-go with the PR checkout. After that replace, the adapter module still needs to refresh its module graph; otherwise Go builds fail with missing go.sum entries for dependencies from the local SDK checkout.

Validation:

• python3 -m py_compile conformance/scripts/use_local_sdk.py
• Simulated the CI path against figtracer/mpp-go:codex/body-digest-server-conformance: use_local_sdk.py --adapter go, go mod download, and go build -o adapter .

Observed affected mpp-go PRs:

• feat: add server body digest and route scope conformance mpp-go#55: missing github.com/redis/go-redis/v9 sum
• Add strict method ID rejection vectors mpp-go#54: missing github.com/redis/go-redis/v9 sum
• chore(deps): bump github.com/redis/go-redis/v9 from 9.20.0 to 9.20.1 in the go-deps group mpp-go#58/#62: same Redis sum failure
• chore(deps): bump the go-deps group across 1 directory with 3 updates mpp-go#63: same adapter-module failure class, with newer SDK dependency sums