chore(deps): update dependency github-pages to v231 (#821)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [github-pages](https://togithub.com/github/pages-gem) | `"~> 230"` ->
`"~> 231"` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/github-pages/231?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/github-pages/231?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/github-pages/230/231?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/github-pages/230/231?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>github/pages-gem (github-pages)</summary>

### [`v231`](https://togithub.com/github/pages-gem/releases/tag/v231)

[Compare
Source](https://togithub.com/github/pages-gem/compare/v230...v231)

#### What's Changed

- Revert jekyll-relative-links to 0.6.1 and add a test by
[@&#8203;yoannchaudet](https://togithub.com/yoannchaudet) in
[github/pages-gem#910

**Full Changelog**:
github/pages-gem@v230...v231

</details>

---

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docs/Gemfile

@@ -11,7 +11,7 @@ source "https://rubygems.org"
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
-gem "github-pages", "~> 230", group: :jekyll_plugins
+gem "github-pages", "~> 231", group: :jekyll_plugins
 # If you have any plugins, put them here!
 group :jekyll_plugins do
   gem "jekyll-feed", "~> 0.15"

docs/Gemfile.lock

@@ -41,7 +41,7 @@ GEM
     ffi (1.16.3)
     forwardable-extended (2.6.0)
     gemoji (4.1.0)
-    github-pages (230)
+    github-pages (231)
       github-pages-health-check (= 1.18.2)
       jekyll (= 3.9.5)
       jekyll-avatar (= 0.8.0)
@@ -57,7 +57,7 @@ GEM
       jekyll-paginate (= 1.1.0)
       jekyll-readme-index (= 0.3.0)
       jekyll-redirect-from (= 0.16.0)
-      jekyll-relative-links (= 0.7.0)
+      jekyll-relative-links (= 0.6.1)
       jekyll-remote-theme (= 0.4.3)
       jekyll-sass-converter (= 1.5.2)
       jekyll-seo-tag (= 2.8.0)
@@ -144,7 +144,7 @@ GEM
       jekyll (>= 3.0, < 5.0)
     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-relative-links (0.7.0)
+    jekyll-relative-links (0.6.1)
       jekyll (>= 3.3, < 5.0)
     jekyll-remote-theme (0.4.3)
       addressable (~> 2.0)
@@ -267,7 +267,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  github-pages (~> 230)
+  github-pages (~> 231)
   http_parser.rb (~> 0.8.0)
   jekyll-feed (~> 0.15)
   tzinfo (>= 1, < 3)