Bump version of androidx.test:runner

Let's see if this is the one dependabot says brings in insecure
dependencies, even though it can't tell (but the dependencies are
referenced through things named test..)

Author: mhagander

app/build.gradle

@@ -38,7 +38,7 @@ dependencies {
     implementation 'androidx.camera:camera-lifecycle:1.4.2'
     implementation 'androidx.camera:camera-view:1.4.2'
     testImplementation 'junit:junit:4.13.2'
-    androidTestImplementation 'androidx.test:runner:1.5.2'
+    androidTestImplementation 'androidx.test:runner:1.7.0'
     implementation 'com.google.code.gson:gson:2.8.9'
     implementation 'com.android.volley:volley:1.2.1'