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[9.20] fix: dev: Fix a data race in dns_zone_getxfrintime()

bind-team-rw-api-rw-repo requested to merge backport-4976-zone-xfrintime-data-race-fix-9.20 into bind-9.20

The dns_zone_getxfrintime() function fails to lock the zone before accessing its 'xfrintime' structure member, which can cause a data race between soa_query() and the statistics channel. Add the missing locking/unlocking pair, like it's done in numerous other similar functions.

Closes #4976 (closed)

Backport of MR !9591 (merged)

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