Bump golang in /binary_transparency/firmware/cmd/ftmapserver (#1059)

Bumps golang from `8d22d45` to `adf7ccb`.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

binary_transparency/firmware/cmd/ftmapserver/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21.6-bullseye@sha256:8d22d45396a5a19a3edeefd48ec23eb1d6b1bcf2205fe84caab41c2321f4374e AS builder
+FROM golang:1.21.6-bullseye@sha256:adf7ccb07fe8ccadf7bb0317f02d2c3a4916f824a23f6975fd36c4bd7feece3f AS builder
 LABEL stage=builder
 
 ARG GOFLAGS=""
@@ -19,7 +19,7 @@ COPY . .
 RUN go build ./binary_transparency/firmware/cmd/ftmapserver
 
 # Build release image
-FROM golang:1.21.6-bullseye@sha256:8d22d45396a5a19a3edeefd48ec23eb1d6b1bcf2205fe84caab41c2321f4374e
+FROM golang:1.21.6-bullseye@sha256:adf7ccb07fe8ccadf7bb0317f02d2c3a4916f824a23f6975fd36c4bd7feece3f
 
 COPY --from=builder /build/ftmapserver /bin/ftmapserver
 ENTRYPOINT ["/bin/ftmapserver"]