fix: update matrix

Author: muzahidul-opti

.github/workflows/android.yml

@@ -84,7 +84,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        api-level: [21, 25, 26, 29]
+        api-level: [24, 25, 26, 29]
     steps:
       - name: checkout
         uses: actions/checkout@v2