[native] Add support for TLS 1.2 for Android 4

Summary:
When I updated the server to Ubuntu 20, this switched us over to [requiring TLS 1.2](https://discourse.ubuntu.com/t/default-to-tls-v1-2-in-all-tls-libraries-in-20-04-lts/12464).

However, Android 4 doesn't have support for TLS 1.2, which means we weren't able to connect to the server.

Luckily, [there's a way](facebook/react-native#23984) to use a third-party lib for TLS 1.2 (and TLS 1.3) support in React Native.

Test Plan: Make sure Android 4.4 client can connect to server

Reviewers: palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D333

native/android/app/build.gradle

@@ -219,6 +219,8 @@ dependencies {
     implementation 'com.facebook.fresco:animated-webp:2.2.0'
     implementation 'com.facebook.fresco:webpsupport:2.2.0'
 
+    implementation 'org.conscrypt:conscrypt-android:2.0.0'
+
     if (enableHermes) {
         def hermesPath = "../../../node_modules/hermes-engine/android/";
         debugImplementation files(hermesPath + "hermes-debug.aar")

native/android/app/src/main/java/org/squadcal/MainApplication.java

@@ -27,6 +27,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.lang.reflect.InvocationTargetException;
+import java.security.Security;
 
 public class MainApplication extends MultiDexApplication implements ReactApplication {
   private final ReactModuleRegistryProvider mModuleRegistryProvider = new ReactModuleRegistryProvider(new BasePackageList().getPackageList(), null);
@@ -67,6 +68,7 @@ public ReactNativeHost getReactNativeHost() {
   @Override
   public void onCreate() {
     super.onCreate();
+    Security.insertProviderAt(new org.conscrypt.OpenSSLProvider(), 1);
     SoLoader.init(this, /* native exopackage */ false);
     initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
   }