Check CRuby depend is up-to-date

I often forget that this is a thing, and it fails CRuby CI
PRs that make such changes should first be made to ruby/ruby to avoid this

Author: Earlopain

.github/workflows/cruby-bindings.yml

@@ -59,3 +59,11 @@ jobs:
           EXCLUDES: ${{ matrix.parser == 'parse.y' && './test/.excludes-parsey' }}
         run: make -j$(nproc) -s test-all
         working-directory: ruby/ruby
+
+      - name: Update depend files
+        run: make fix-depends
+        working-directory: ruby/ruby
+      - name: Check depend is up-to-date
+        run: git diff --color --no-ext-diff --ignore-submodules --exit-code -- depend
+        working-directory: ruby/ruby
+