fix(lantern_hnsw/build.c): index size exceeded build warning.

[wangxuqi]

For now the warning is:
WARNING: index size exceeded maintenance_work_mem during index construction, consider increasingmaintenance_work_mem

Fix it to
WARNING: index size exceeded maintenance_work_mem during index construction, consider increasing maintenance_work_mem

[greptile-apps]

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[CLAassistant]

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