Update dependency ubuntu to v24 (#643)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -71,7 +71,7 @@ jobs:
         run: crystal tool format --check src spec
 
   docs:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Download source
         uses: actions/checkout@v4