fix: return type of vector_norm for svector & bvector (#487)

Signed-off-by: usamoi <usamoi@outlook.com>

Author: usamoi

src/sql/finalize.sql

@@ -641,10 +641,10 @@ STRICT PARALLEL SAFE LANGUAGE c AS 'MODULE_PATHNAME', '_vectors_vecf32_norm_wrap
 CREATE FUNCTION vector_norm(vecf16) RETURNS real
 STRICT PARALLEL SAFE LANGUAGE c AS 'MODULE_PATHNAME', '_vectors_vecf16_norm_wrapper';
 
-CREATE FUNCTION vector_norm(svector) RETURNS INT
+CREATE FUNCTION vector_norm(svector) RETURNS real
 STRICT PARALLEL SAFE LANGUAGE c AS 'MODULE_PATHNAME', '_vectors_svecf32_norm_wrapper';
 
-CREATE FUNCTION vector_norm(bvector) RETURNS INT
+CREATE FUNCTION vector_norm(bvector) RETURNS real
 STRICT PARALLEL SAFE LANGUAGE c AS 'MODULE_PATHNAME', '_vectors_bvecf32_norm_wrapper';
 
 CREATE FUNCTION vector_norm(veci8) RETURNS real