build(deps): bump golang in /examples/xds-sotw-config-server

Bumps golang from 1.22.6 to 1.23.1.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

examples/xds-sotw-config-server/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.22.6@sha256:2bd56f00ff47baf33e64eae7996b65846c7cb5e0a46e0a882ef179fd89654afa AS build
+FROM golang:1.23.1@sha256:4a3c2bcd243d3dbb7b15237eecb0792db3614900037998c2cd6a579c46888c1e AS build
 WORKDIR /xds-server
 
 COPY . .