Declare Orekit's Nexus as mirror

.CI/maven-settings.xml

 <settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns="http://maven.apache.org/SETTINGS/1.0.0"
           xsi:schemalocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
+    <mirrors>
+        <!-- mirror
+        | Specifies a repository mirror site to use instead of a given repository. The repository that
+        | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used
+        | for inheritance and direct lookup purposes, and must be unique across the set of mirrors.
+        |
+        <mirror>
+        <id>mirrorId</id>
+        <mirrorOf>repositoryId</mirrorOf>
+        <name>Human Readable Name for this Mirror.</name>
+        <url>http://my.repository.com/repo/path</url>
+        </mirror>
+        -->
+        <mirror>
+            <id>Nexus-Orekit</id>
+            <name>Maven Repository Manager</name>
+            <url>https://packages.orekit.org/repository/maven-public/</url>
+            <mirrorOf>central</mirrorOf>
+        </mirror>
+    </mirrors>
     <servers>
         <server>
             <id>ci-releases</id>