init size exceptions since we know we only need one

Co-authored-by: Markus Hintersteiner <m.hintersteiner@gmail.com>

Author: supervacuus

sentry-android-core/src/main/java/io/sentry/android/core/internal/tombstone/TombstoneParser.java

@@ -121,7 +121,7 @@ private List<SentryException> createException(TombstoneProtos.Tombstone tombston
     exception.setMechanism(createMechanismFromSignalInfo(signalInfo));
     exception.setThreadId((long) tombstone.getTid());
 
-    List<SentryException> exceptions = new ArrayList<>();
+    List<SentryException> exceptions = new ArrayList<>(1);
     exceptions.add(exception);
 
     return exceptions;