Update the rsa end date to make it not expiry

Author: carmenlau

skygear/src/main/java/io/skygear/skygear/SecurePersistentStore.java

@@ -263,7 +263,7 @@ private PublicKey generateRSAPublicKey(final String alias) throws NoSuchAlgorith
                 NoSuchProviderException, InvalidAlgorithmParameterException {
             Calendar start = Calendar.getInstance();
             Calendar end = Calendar.getInstance();
-            end.add(Calendar.YEAR, 1);
+            end.add(Calendar.YEAR, 100);
             KeyPairGeneratorSpec spec = new KeyPairGeneratorSpec.Builder(context)
                     .setAlias(alias)
                     .setSerialNumber(BigInteger.ONE)