Update 6.8 endpoint in Credits API for 6.8.2

[audrasjb]

Here is the list of dotorg accounts who contributed to 6.8.2, and are not credited in 6.8 yet:

czarate
sandeepdahiya
oferlaor
helgatheviking
rollybueno
harshgajipara
darshitrajyaguru97
gernberg
divinenephron
Sam_a
wpsmith
anatolbroder
ericlewis
puggan
guddu1315
pfefferle
bugnumber9
getsyash
brhodes
dustintechsmith
paulstanos
kraftbj
mwillman1991
jigarpanchal
kishanjasani
benjamingosset
mindctrl
uxl
mayankyripathi32

​Full 6.8.2 props list available here

[coffee2code]

In 14485:

Credits API: Update credits for 6.8.2.

Props audrasjb.
Fixes #8034.