[6.x] Update changelog for v6.18.27 with upgrade info around cookies #36490
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Anyone upgrading to >= v6.18.27 will have all their cookies invalidated.
This seems like an important point to highlight that I didn't see mentioned anywhere. I only found it after basically doing a binary search through upgrades to find out which version borked our cookies.
For some apps this means that all their users will be logged out at once - which could have a bunch of implications (not to mention an annoyance for the users)
I may have just completely missed the memo on this - but there was no info on the PR (#33662) and the discussion is currently locked.
Supercedes #36489 (changed to target 6.x instead of 8.x)