chore(deps): update dependency postgresql-18-pgvector

[renovate]

This PR contains the following updates:

Package	Update	Change
postgresql-18-pgvector	patch	0.8.5 → 0.8.6
postgresql-18-pgvector	patch	0.8.5-1.pgdg13+1 → 0.8.6-1.pgdg13+1
postgresql-18-pgvector	patch	0.8.5-1.pgdg12+1 → 0.8.6-1.pgdg12+1

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Release Notes

pgvector/pgvector (postgresql-18-pgvector)

v0.8.6

• Fixed buffer overflow with IVFFlat index build on 32-bit systems - more info
• Fixed array to sparsevec cast not limiting non-zero elements
• Fixed memory usage for IVFFlat index scans with nested loop joins

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