Bump golang in /trillian/examples/deployment/docker/ctfe (#1216)

Bumps golang from `20f9ab5` to `5ee1296`.

---
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:1.21.3-bookworm@sha256:20f9ab52a8c3598ef13f86c9bc3b94db400e13df115ecacd8c3dfd0c0f060208 as build
+FROM golang:1.21.3-bookworm@sha256:5ee12963390a919952d80f1d7894c75a43467f6ab1d4204325093e62705f3609 as build
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS