Bump golang in /integration/cloudbuild/testbase in the docker-deps gr…

…oup (#3614)

Bumps the docker-deps group in /integration/cloudbuild/testbase with 1 update: golang.


Updates `golang` from 1.23.0-bookworm to 1.23.1-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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

integration/cloudbuild/testbase/Dockerfile

@@ -1,5 +1,5 @@
 # This Dockerfile builds a base image for Trillan integration tests.
-FROM golang:1.23.0-bookworm@sha256:31dc846dd1bcca84d2fa231bcd16c09ff271bcc1a5ae2c48ff10f13b039688f3
+FROM golang:1.23.1-bookworm@sha256:1a5326b07cbab12f4fd7800425f2cf25ff2bd62c404ef41b56cb99669a710a83
 
 WORKDIR /testbase