Update actions/checkout action to v3 (#17)

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

Author: renovate[bot]

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
         ruby_version: ["2.7"]
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: "Set up Ruby ${{ matrix.ruby_version }}"
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/ruby.yml

@@ -15,7 +15,7 @@ jobs:
         ruby-version: ['2.6', '2.7', '3.0', '3.1']
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: