Bump golang

Bumps the docker-deps group in /examples/deployment/docker/log_signer with 1 update: golang.


Updates `golang` from 1.22.5-bookworm to 1.22.6-bookworm

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

Signed-off-by: dependabot[bot] <support@github.com>

examples/deployment/docker/log_signer/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.22.5-bookworm@sha256:af9b40f2b1851be993763b85288f8434af87b5678af04355b1e33ff530b5765f as build
+FROM golang:1.22.6-bookworm@sha256:39b7e6ebaca464d51989858871f792f2e186dce8ce0cbdba7e88e4444b244407 as build
 
 WORKDIR /trillian