build(deps): bump golang in /examples/xds-sotw-config-server (#762)

Bumps golang from 1.22.6 to 1.23.3.

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/xds-sotw-config-server/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.22.6@sha256:2bd56f00ff47baf33e64eae7996b65846c7cb5e0a46e0a882ef179fd89654afa AS build
+FROM golang:1.23.3@sha256:d56c3e08fe5b27729ee3834854ae8f7015af48fd651cd25d1e3bcf3c19830174 AS build
 WORKDIR /xds-server
 
 COPY . .