Bump httpclient from 4.5.12 to 4.5.13 in /java

Bumps httpclient from 4.5.12 to 4.5.13.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpclient
  dependency-type: direct:production
...
Signed-off-by: Ndependabot[bot] <support@github.com>

java/pom.xml

@@ -148,7 +148,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.5.12</version>
+            <version>4.5.13</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>