Update libsignalservice to 2.13.0

- Eliminate the explicit spongycastle dependency. All access to
  primitives is done through the JCE interfaces now, which allows
  us to use a secure native-backed provider like conscrypt.

- Use conscrypt for our default security provider. This gives us
  fast TLS 1.2 and 1.3 support on all devices, even before they
  had platform support (like 4.4).

- Update minSdk to 18. Unfortunately the JCE interfaces for GCM
  primitives are JDK 7+ (!) only, which became supported by Android
  at 18.

src/org/thoughtcrime/securesms/jobs/RetrieveProfileJob.java

@@ -25,6 +25,7 @@ import org.whispersystems.libsignal.InvalidKeyException;
 import org.whispersystems.libsignal.util.guava.Optional;
 import org.whispersystems.signalservice.api.SignalServiceMessagePipe;
 import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
+import org.whispersystems.signalservice.api.crypto.InvalidCiphertextException;
 import org.whispersystems.signalservice.api.crypto.ProfileCipher;
 import org.whispersystems.signalservice.api.crypto.UnidentifiedAccess;
 import org.whispersystems.signalservice.api.crypto.UnidentifiedAccessPair;
@@ -210,7 +211,7 @@ public class RetrieveProfileJob extends ContextJob implements InjectableType {
       if (!Util.equals(plaintextProfileName, recipient.getProfileName())) {
         DatabaseFactory.getRecipientDatabase(context).setProfileName(recipient, plaintextProfileName);
       }
-    } catch (ProfileCipher.InvalidCiphertextException | IOException e) {
+    } catch (InvalidCiphertextException | IOException e) {
       Log.w(TAG, e);
     }
   }