Bump up crt version

Author: zoewangg

.changes/next-release/feature-AWSCommontRuntimeHTTPClient-536d33d.json

@@ -0,0 +1,6 @@
+{
+    "category": "AWS Commont Runtime HTTP Client", 
+    "contributor": "", 
+    "type": "feature", 
+    "description": "Upgrade `aws-crt` to version `0.9.3`"
+}

pom.xml

@@ -111,7 +111,7 @@
         <rxjava.version>2.1.9</rxjava.version>
         <commons-codec.verion>1.10</commons-codec.verion>
         <jmh.version>1.21</jmh.version>
-        <awscrt.version>0.9.0</awscrt.version>
+        <awscrt.version>0.9.3</awscrt.version>
 
         <!-- Test dependencies -->
         <junit.version>4.12</junit.version>