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Fix a data race in dns__catz_update_cb()

Arаm Sаrgsyаn requested to merge 3968-catz-data-race-in-dns__catz_update_cb into main

The dns__catz_update_cb() function was earlier updated (see d2ecff3c) to use a separate 'dns_db_t' object ('catz->updb' instead of 'catz->db') to avoid a race between the 'dns__catz_update_cb()' and 'dns_catz_dbupdate_callback()' functions, but the 'REQUIRE' check there still checks the validity of the 'catz->db' object.

Fix the omission.

Closes #3968 (closed)

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