Upgraded httpcore from 4.4.14 to 4.4.15 (#436)

Bumps httpcore from 4.4.14 to 4.4.15.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpcore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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pom.xml

@@ -150,7 +150,7 @@
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>
         <artifactId>httpcore</artifactId>
-        <version>4.4.14</version>
+        <version>4.4.15</version>
       </dependency>
       <dependency>
         <groupId>org.apache.maven</groupId>