[9.20] chg: dev: Fix data race in clean_finds_at_name
requested to merge backport-4118-data-race-lib-dns-adb-c-1537-in-clean_finds_at_name-9.20 into bind-9.20
Stop updating find.result_v4 and find.result_v4 in clean_finds_at_name. The values are supposed to be static.
Closes #4118 (closed)
Backport of MR !9108 (merged)