feat: update dependency ruby to v4 (#19)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
           bun-version: "1.3.5"
       - uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
         with:
-          ruby-version: "3.3"
+          ruby-version: "4.0.1"
       - run: gem install ruby-lsp
       - run: bun install
       - run: bun run build