chore: update rust toolchain to 2026-03-21 (#7849)

* chore: update rust toolchain to 2026-03-21

* chore: new format

* fix: lint

* chore: resolve lint issues

* chore: remove as_millis_f64

* chore: deps up

src/common/sql/src/default_constraint.rs

@@ -122,7 +122,7 @@ pub fn parse_column_default_constraint(
 
 #[cfg(test)]
 mod test {
-    use std::assert_matches::assert_matches;
+    use std::assert_matches;
 
     use datatypes::prelude::{ConcreteDataType, Value};
     use datatypes::types::BooleanType;

src/common/sql/src/lib.rs

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#![feature(assert_matches)]
-
 pub mod convert;
 pub mod default_constraint;
 pub mod error;