main/busybox: Correct secfix version for CVE-2021-28831

An incorrect fix version was added for CVE-2021-28831 in commit
a8847f26. That commit references
busybox 1.32 which isn't available in Alpine 3.12. The fix was
originally committed in 0d639f13
along with the correct secfix version.
7 jobs for !27494 with grepory/busybox in 1 minute and 23 seconds (queued for 6 seconds)
merge request
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