Aperture: Set minimum SDK version to 31

Change-Id: Iebf45198569facae72aba296b870f4b7d52fffab
diff --git a/app/build.gradle b/app/build.gradle
index 63169f4..3c7901d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,7 +8,7 @@
 
     defaultConfig {
         applicationId "org.lineageos.aperture"
-        minSdk 29
+        minSdk 31
         targetSdk 33
         versionCode 1
         versionName "1.0"