databases/pgvector: Update from 0.7.3 to 0.7.4
Changelog: * Fixed locking for parallel HNSW index builds * Fixed compilation error with GCC 14 on i386 when SSE2 is not enabled Taken from: https://github.com/pgvector/pgvector/blob/master/CHANGELOG.md
Sponsored by: P. Variablis
(cherry picked from commit 723f5302fb06fc642d672ca5cf51c0079b38c914)