Update preferred Ruby version to 3.3, update deps (#1460)

This PR essentially updates the "default" Ruby version to 3.3. In the process, it:

- fixes a bug with the linux platform for `sass-embedded`
- regenerates the `Gemfile.lock` with Bundler 2.5.9
- adds Ruby 3.3 to the testing matrix & updates our deployment actions to use Ruby 3.3
- removes Ruby 3.0 from the testing matrix, as it is now end of life

This PR is motivated by https://github.com/just-the-docs/just-the-docs-template/pull/45, where I discovered that depending on the bundler/RubyGems version, the platform resolution for platformed gems can fail.

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         jekyll-version: [3.9, 4.3]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        ruby-version: ["3.0", "3.1", "3.2"]
+        ruby-version: ["3.1", "3.2", "3.3"]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4

.github/workflows/deploy.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.2"
+          ruby-version: "3.3"
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
       - name: Setup Pages

.github/workflows/publish-gem.yml

@@ -10,10 +10,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Setup Ruby 3.2
+    - name: Setup Ruby 3.3
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: "3.2"
+        ruby-version: "3.3"
 
     - name: Publish to GPR
       run: |