pom: enforce https when accessing maven repos

as dcache.org hae disabled http->https redirection some builds start to
fail.

Fixes: #98
Target: master, 0.22, 0.21
(cherry picked from commit 207eeb3a)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
1 job for 0.21 in 1 minute and 9 seconds (queued for 2 seconds)
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