Update CI to account for Opal 1.3 release

Author: hmdne

.github/workflows/build.yml

@@ -19,19 +19,19 @@ jobs:
             browser: chrome
             os: ubuntu-latest
             opal: master
-          - name: Chromium/Linux/Opal-master/PromiseV2
+          - name: Chromium/Linux/Opal-1.3/PromiseV2
             browser: chrome
             os: ubuntu-latest
-            opal: master
+            opal: 1.3
             promise: v2
-          - name: Chromium/Linux/Opal-1.2
+          - name: Chromium/Linux/Opal-1.3
             browser: chrome
             os: ubuntu-latest
-            opal: 1.2
-          - name: Chromium/Linux/Opal-1.1
+            opal: 1.3
+          - name: Chromium/Linux/Opal-1.2
             browser: chrome
             os: ubuntu-latest
-            opal: 1.1
+            opal: 1.2
           - name: Chromium/Linux/Opal-1.0
             browser: chrome
             os: ubuntu-latest
@@ -72,7 +72,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: set environment variables
         run: |
-          echo "OPAL_VERSION=${{ matrix.combo.opal || '1.2' }}" >> $GITHUB_ENV
+          echo "OPAL_VERSION=${{ matrix.combo.opal || '1.3' }}" >> $GITHUB_ENV
           echo "OPAL_BROWSER_PROMISE=${{ matrix.combo.promise || 'v1' }}" >> $GITHUB_ENV
       - uses: ruby/setup-ruby@v1
         with: