Do not test on Java 20 anymore

No longer supported.

Author: acogoluegnes

.github/workflows/test-supported-java-versions-5.x.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        java: [ '8', '11', '17', '20', '21' ]
+        java: [ '8', '11', '17', '21' ]
     name:  Test against Java ${{ matrix.java }}
     steps:
       - uses: actions/checkout@v4

.github/workflows/test-supported-java-versions-main.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        java: [ '8', '11', '17', '20', '21' ]
+        java: [ '8', '11', '17', '21' ]
     name:  Test against Java ${{ matrix.java }}
     steps:
       - uses: actions/checkout@v4