Bump aws-crt version to 0.21.16 (#4019)

Author: debora-ito

pom.xml

@@ -114,7 +114,7 @@
         <rxjava.version>2.2.21</rxjava.version>
         <commons-codec.verion>1.15</commons-codec.verion>
         <jmh.version>1.29</jmh.version>
-        <awscrt.version>0.21.12</awscrt.version>
+        <awscrt.version>0.21.16</awscrt.version>
 
         <!--Test dependencies -->
         <junit5.version>5.8.1</junit5.version>