Bump golang in /trillian/examples/deployment/docker/ctfe (#1158)

Bumps golang from `d3114db` to `a0b3bc4`.

---
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>

trillian/examples/deployment/docker/ctfe/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21.1-bookworm@sha256:d3114db136e7f2d9b08c3fcd374381ba3f8d85c17b80c48dbc53cd938cfb2b64 as build
+FROM golang:1.21.1-bookworm@sha256:114b9cc39f435cfc34e2d48d0cb12cba2015a87f359f5dbf3ee3b6cf3591b7fb as build
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS