Bugfix: Maven 4 consumers need sonatypeOssDistMgmtStagingUrl to be defined

* bugfix: maven 4 consumers need `sonatypeOssDistMgmtStagingUrl` to be defined
* chore: add actual values to `sonatypeOssDistMgmtStagingUrl`
[backport] eclipse-ee4j#2420 to 4.x branch (eclipse-ee4j#2421)

Author: lprimak

pom.xml

@@ -120,6 +120,9 @@
         <build.type>SNAPSHOT</build.type>
         <maven.build.timestamp.format>yyyyMMddHHmm</maven.build.timestamp.format>
         <build.qualifier>v${maven.build.timestamp}</build.qualifier>
+        <sonatypeOssDistMgmtNexusUrl>https://jakarta.oss.sonatype.org/</sonatypeOssDistMgmtNexusUrl>
+        <sonatypeOssDistMgmtStagingUrl>${sonatypeOssDistMgmtNexusUrl}content/repositories/staging/</sonatypeOssDistMgmtStagingUrl>
+
         <bundle.version>${release.version}.${build.qualifier}</bundle.version>
         <project.build.testReports.settings>test-report-settings/surefire-report.properties</project.build.testReports.settings>
         <project.build.testReports.subdirectory>test-reports</project.build.testReports.subdirectory>