Upgrade XWiki iLTS 17.4.2 to iLTS17.4.3 "Failed to retrieve extension data.Gateway Time-out"

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Since you moved to a new Tomcat version, maybe you skipped https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Installation/InstallationViaAPT/#HMemory (which is still true with Tomcat 10) ?