Refactored ci to support minimum api level 24

* Since our minimum API level is now 24, we have updated our CI configuration to run on API level 24, which aligns with the minimum API level required for our project.

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     name: Automated tests
     strategy:
       matrix:
-        api-level: [ 21, 30, 33 ]
+        api-level: [ 24, 30, 33 ]
       fail-fast: false
     runs-on: macos-11
     steps:
@@ -79,16 +79,16 @@ jobs:
           path: screencap.png
 
       - name: create unit coverage
-        if: ${{ matrix.api-level==21 }}
+        if: ${{ matrix.api-level==24 }}
         run: ./gradlew testDebugUnitTest testCustomexampleDebugUnitTest
 
       - name: Upload coverage to Codecov
-        if: ${{ matrix.api-level==21 }}
+        if: ${{ matrix.api-level==24 }}
         uses: codecov/codecov-action@v3
 
       - name: Upload Coverage to GH-Actions
         uses: actions/upload-artifact@v3
-        if: ${{ matrix.api-level==21 }}
+        if: ${{ matrix.api-level==24 }}
         with:
           name: Tests Coverage Report
           path: |