Allow "same-origin" as "Referrer-Policy" (Backport to stable14) #11950
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Fixes #11531
Although "same-origin" is more strict than e.g. strict-origin it showed up a warning in setupcheck
Based on https://scotthelme.co.uk/a-new-security-header-referrer-policy/
Signed-off-by: Moritz Beck git@birkenstab.de