Add Java 20 to build matrix

Author: mcculls

.github/workflows/build.yml

@@ -13,14 +13,14 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        java: [ '11', '17' ]
+        java: [ '11', '17', '20' ]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-java@v2
+      - uses: actions/setup-java@v3
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'