sql/logictest: remove assignment cast TODO

This commit removes a TODO that was partially addressed by cockroachdb#82022.

Informs cockroachdb#73743

Release note: None

pkg/sql/logictest/testdata/logic_test/cast

@@ -165,10 +165,7 @@ PREPARE insert_f4 AS INSERT INTO assn_cast(f4) VALUES ($1)
 statement ok
 EXECUTE insert_f4(18754999.99)
 
-# TODO(mgartner): Values are not correctly truncated when cast to FLOAT4, either
-# in an assignment or explicit context. The columns should have a value of
-# 1.8755e+07. See #73743.
-query F
+query F rowsort
 SELECT f4 FROM assn_cast WHERE f4 IS NOT NULL
 ----
 1.8755e+07