fix(actions): Fix github actions error (see jeffreytse/jekyll-deploy-…

…action#70)

.github/workflows/build-jekyll.yml

@@ -31,7 +31,7 @@ jobs:
           jekyll_src: './'           # Default is root directory
           jekyll_cfg: '_config.yml'  # Default is _config.yml
           jekyll_baseurl: ''         # Default is according to _config.yml
-          bundler_ver: '>=0'         # Default is latest bundler version
+          bundler_ver: ''            # Default is compatible bundler version (~>2.4.0)
           cname: 'scalastic.io'      # Default is to not use a cname
           actor: ''                  # Default is the GITHUB_ACTOR
           pre_build_commands: pacman-key --init; pacman -S --noconfirm git-lfs libvips lcms2 openjpeg2 libpng libwebp libheif imagemagick openslide libjxl poppler-glib