test: Add Node.js 20 LTS to the test matrix

Author: KallynGowdy

.github/workflows/continuous-integration-workflow.yml

@@ -8,7 +8,7 @@ jobs:
         strategy:
             matrix:
                 os: [ubuntu-latest, macos-12, windows-latest]
-                node-version: [12.x]
+                node-version: [12.x, 20.x]
                 deno-version: [1.40.x]
         runs-on: ${{ matrix.os }}
         steps: