Upgrade to Hugo 0.123.3

.github/workflows/build-and-deploy.yaml

@@ -54,7 +54,7 @@ jobs:
       # NOTE: It sometimes happens that new Hugo versions break the site. So I've decided to always
       #   "pin" the Hugo version (instead of using the latest version). This way, the Hugo version
       #   can be updated with a pull request where I can test the new version.
-      HUGO_VERSION: 0.122.0
+      HUGO_VERSION: 0.123.3
 
       # The directory in which Hugo stores the generated site.
       # NOTE: '${{ runner.temp }}' isn't available here so we have to use '${{ github.workspace }}'.