Socket timeout reading repository from ci.eclipse.org again

#6715 (closed) is occurring yet again.

!ENTRY org.eclipse.equinox.p2.transformer 4 0 2026-03-03 08:16:17.559
!MESSAGE Messages while mirroring artifact descriptors.
!SUBENTRY 1 org.eclipse.equinox.p2.transport.ecf 4 1002 2026-03-03 08:16:17.559
!MESSAGE Unable to read repository at https://ci.eclipse.org/modisco/job/modisco-master/9/artifact/org.eclipse.modisco.updatesite/target/repository/plugins/org.eclipse.modisco.xml.doc_1.6.0.v20260303-0659.jar.
!STACK 0
java.net.SocketTimeoutException: Read timed out
	at java.base/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:283)
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:309)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:350)
	at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:803)
	at java.base/java.net.Socket$SocketInputStream.read(Socket.java:966)

See https://ci.eclipse.org/modisco/job/modisco-promoter/11/console and https://ci.eclipse.org/modisco/job/modisco-promoter/10/console. Usually retrying is sufficient to allow 'slow' availability to be resolved. Not today.