Disable Ruby updates by Renovate and revert to Ruby v3 (#745)

Ruby version upgrades should be performed manually. Updating Ruby
requires changes to the CI configuration, and language versions do not
necessarily follow semantic versioning.

Since Ruby v4 has not been sufficiently validated yet, we will revert to
v3 for now.

Author: eucyt

.github/workflows/deploy-doc.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - uses: ruby/setup-ruby@708024e6c902387ab41de36e1669e43b5ee7085e # v1.283.0
         with:
-          ruby-version: '4.0.1'
+          ruby-version: '3.4.8'
       - run: bundle install
       - name: Setup Pages
         uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: ruby/setup-ruby@708024e6c902387ab41de36e1669e43b5ee7085e # v1.283.0
         with:
           bundler-cache: true
-          ruby-version: 4.0.1
+          ruby-version: 3.4.8
       - name: Update version file with the release version
         run: |
           if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then

renovate.json5

@@ -32,5 +32,13 @@
         '/line-openapi/',
       ],
     },
+    {
+      // Disable automatic Ruby version updates
+      // Language version updates should be handled manually
+      matchPackageNames: [
+        'ruby',
+      ],
+      enabled: false,
+    },
   ],
 }