[FLINK-16947][Azure] Attempt to fix the "Entry has not been leased fr…

[rmetzger]

This is the change to the docker image rmetzger/flink-ci@7ac4e28
We've had deployed the updated http wagon version on master for quite a while, and it seemed to have improved the situation a lot. This is a backport of the latest docker image for release-1.12.

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Last check on commit 36f4e0b (Fri May 28 08:59:11 UTC 2021)

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