Use ruby-version instead of deprecated version

Author: znz

.github/workflows/ubuntu.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Ruby
       uses: actions/setup-ruby@v1
       with:
-        version: ${{ matrix.ruby }}
+        ruby-version: ${{ matrix.ruby }}
     - name: Install dependencies
       run: |
         gem install bundler --no-document

.github/workflows/windows.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Ruby
       uses: actions/setup-ruby@v1
       with:
-        version: ${{ matrix.ruby }}
+        ruby-version: ${{ matrix.ruby }}
     - name: Set up Bundler
       run: gem install bundler --no-document
     - name: Install dependencies