Bump actions/checkout from 3 to 4 (#510)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to
4.

Author: rzhade3

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
         ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby ${{ matrix.ruby }}
       uses: ruby/setup-ruby@v1
       with: