Bump httpclient from 4.5.12 to 4.5.13

Bumps httpclient from 4.5.12 to 4.5.13.

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/doxia-core/pom.xml b/doxia-core/pom.xml
index dee97df..2b8a313 100644
--- a/doxia-core/pom.xml
+++ b/doxia-core/pom.xml
@@ -62,7 +62,7 @@
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpclient</artifactId>
-      <version>4.5.12</version>
+      <version>4.5.13</version>
     </dependency>
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>