Update the location of the Cloudant Maven repository

The site `maven.cloudant.com` is going to be closed down by March
2025.  To keep building Clouseau from source working, the artifacts
for the Cloudant-custom fork of Apache Lucene have been moved to
https://cloudant.github.io/maven .  Note that all the other
dependencies are now either retrieved from Maven Central or have
been imported into the source tree.

pom.xml

@@ -25,7 +25,7 @@
     <repository>
       <id>CloudantPublicRepo</id>
       <name>Cloudant Public Repo</name>
-      <url>https://maven.cloudant.com/repo/</url>
+      <url>https://cloudant.github.io/maven/repo/</url>
     </repository>
   </repositories>