Update pgvector to v0.8.2

Author: surbhat1595

pg_tarballs/pg_tarballs_builder.sh

@@ -186,7 +186,7 @@ PGBACKREST_BRANCH="release/2.58.0"
 PGBADGER_BRANCH="v13.2"
 PATRONI_BRANCH="v4.1.0"
 HAPROXY_BRANCH="v2.8.18"
-PGVECTOR_BRANCH="v0.8.1"
+PGVECTOR_BRANCH="v0.8.2"
 PG_TDE_BRANCH="release-2.1.2"
 PG_OIDC_BRANCH="release-1.0"