Update Java, Ubuntu versions (CI)

Author: robotgryphon

.github/workflows/ci-tests.yml

@@ -5,7 +5,7 @@ on: push
 jobs:
   vars:
     name: Get Variables
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       release_type: ${{steps.cf_release_type.outputs.value }}
       mod_version: ${{steps.mod_version.outputs.value }}
@@ -29,16 +29,16 @@ jobs:
 
   jar:
     name: Publish JAR
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     needs: [vars]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Set up JDK 1.8
+      - name: Set up JDK 8
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: "8.0.282"
 
 #       - name: Cache Gradle packages
 #         uses: actions/cache@v2