Upgrade httpclient to 4.5.12
<properties>
<antlr.version>3.5.2</antlr.version>
<antlr4.version>4.5</antlr4.version>
- <apache.httpclient.version>4.5.11</apache.httpclient.version>
+ <apache.httpclient.version>4.5.12</apache.httpclient.version>
<apache.httpcore.version>4.4.13</apache.httpcore.version>
<asm.version>7.0</asm.version>
<!-- Athenz dependencies. Make sure these dependencies match those in Vespa's internal repositories -->
