Upgrade Apache Parent Pom to 19

Descriptions of the changes in this PR:
Update the reference to the common Apache Parent POM, version 19


### Motivation
Be up to date with ASF-wide configurations

### Changes
Change the version




Reviewers: Sijie Guo <None>

This closes #2184 from eolivelli/fix/update-apache-parent
diff --git a/pom.xml b/pom.xml
index 604ae52..0ffb7f6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,7 +19,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>18</version>
+    <version>19</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.bookkeeper</groupId>