java 8 removed

Author: yegor256

.github/workflows/mvn.yml

@@ -8,12 +8,12 @@ on:
     branches:
       - master
 jobs:
-  maven-build:
+  mvn:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-2022, ubuntu-20.04, macos-12]
-        java: [1.8, 11, 13]
+        os: [windows-2022, ubuntu-22.04, macos-12]
+        java: [11, 20]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-java@v1