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Grow the lex token buffer in one more place

Mark Andrews requested to merge 3175-add-missing-grow-data-call-in-isc-lex-gettoken into main

when parsing key pairs if the '=' character fell at max_token a protective INSIST preventing buffer overrun could be triggered. Attempt to grow the buffer immediately before the INSIST.

Also removed an unnecessary INSIST on the opening double quote of key buffer pair.

Replaces https://gitlab.isc.org/isc-private/bind9/-/merge_requests/377

Closes #3175 (closed)

Edited by Evan Hunt

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