fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEHTTPCOMPONENTS-31517

Author: snyk-bot

pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpclient</artifactId>
-      <version>4.5.1</version>
+      <version>4.5.2</version>
     </dependency>
     <dependency>
       <groupId>commons-codec</groupId>