Bump up CRT version (aws#2738)

* Bump up CRT version

* Bump up CRT version

Author: zoewangg

pom.xml

@@ -113,7 +113,7 @@
         <rxjava.version>2.2.21</rxjava.version>
         <commons-codec.verion>1.10</commons-codec.verion>
         <jmh.version>1.29</jmh.version>
-        <awscrt.version>0.13.14</awscrt.version>
+        <awscrt.version>0.15.2</awscrt.version>
 
         <!--Test dependencies -->
         <junit.version>4.13.1</junit.version>