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[9.18] Do not use header_prev in expire_lru_headers

Ondřej Surý requested to merge 4595-fix-expire-lru-headers-race-9.18 into v9.18.25-release

dns__cacherbt_expireheader can unlink / free header_prev underneath it. Use ISC_LIST_TAIL after calling dns__cacherbt_expireheader instead to get the next pointer to be processed.

(cherry picked from commit 7ce2e860)

Closes #4595 (closed)

Backport of !8773 (merged)

Edited by Ondřej Surý

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