Bump to v231 and prepare release

Author: yoannchaudet

Gemfile

@@ -5,7 +5,7 @@ source "https://rubygems.org"
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # Manage our dependency on the version of the github-pages gem here.
-gem "github-pages", "= 230"
+gem "github-pages", "= 231"
 
 # Explicitly include this gem here.
 # It is not directly included in the github-pages gem list of dependencies,

action.yml

@@ -28,4 +28,4 @@ inputs:
     default: ${{ github.token }}
 runs:
   using: 'docker'
-  image: 'docker://ghcr.io/actions/jekyll-build-pages:v1.0.11'
+  image: 'docker://ghcr.io/actions/jekyll-build-pages:v1.0.12'