Use ubuntu-latest

Author: skydoves

.github/workflows/pull-request.yml

@@ -5,14 +5,16 @@ on: [push, pull_request]
 jobs:
   test:
     name: Build app
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up JDK 17
       uses: actions/setup-java@v2
       with:
         distribution: adopt
         java-version: 17
+
     - name: Build app
       run: ./gradlew assembleDebug