Update OS version used in CI

Also updates JDK & config along the way, as it seems that JVM 1.8 does
not play nicely with the SDK on some part of the new OS somehow
(unclear exactly why, but whatever).

Author: pimterry

.github/workflows/ci.yml

@@ -3,14 +3,14 @@ on: [push, pull_request]
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up JDK 1.8
+      - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 11
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v2
@@ -27,7 +27,7 @@ jobs:
   deploy:
     name: Deploy to GitHub Releases
     needs: build
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     steps:
       - name: Get the APK