build: switch renovate.json to JSON5 for comment support #25991

Job	Run time
collect-and-verify	7m 7s
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 24s
lms-2(py=3.11,dj=pinned,mongo=7.0)	14m 19s
lms-3(py=3.11,dj=pinned,mongo=7.0)	19m 29s
lms-4(py=3.11,dj=pinned,mongo=7.0)	24m 7s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 10s
lms-6(py=3.11,dj=pinned,mongo=7.0)	19m 3s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 36s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	20m 3s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	11m 21s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 19s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 54s
cms-2(py=3.11,dj=pinned,mongo=7.0)	21m 5s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 41s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 26s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 56s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 39s
Unit tests successful	4s
compile-warnings-report	10s
coverage (3.11)	1m 31s
	3h 46m 24s

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