Bump golang in /trillian/examples/deployment/docker/ctfe (#1183)

Bumps golang from 1.21.1-bookworm to 1.21.2-bookworm.

---
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@sha256:61f84bc8cddb878258b2966d682c11a1317e97a371ff0da98823d9e326d9dac1 as build
+FROM golang:1.21.2-bookworm@sha256:a44d05d5de3474f8135462903bbf74a0fdb761aec455ff557c467339dc0b729b as build
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS