fix: restore proper testing matrices (minus Java 16)

Author: metacosm

.github/workflows/pr.yml

@@ -15,12 +15,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        #        java: [11, 16]
         java: [ 11 ]
-        distribution: [ temurin ]
-        kubernetes: [ 'v1.22.1' ]
-    #        distribution: [ temurin, adopt-openj9 ]
-    #        kubernetes: [ 'v1.17.13','v1.18.20','v1.19.14','v1.20.10','v1.21.4', 'v1.22.1' ]
+        distribution: [ temurin, adopt-openj9 ]
+        kubernetes: [ 'v1.17.13','v1.18.20','v1.19.14','v1.20.10','v1.21.4', 'v1.22.1' ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Java and Maven