Fix mismatched_lifetime_syntaxes warnings

Author: mlafeldt

crates/duckdb/src/column.rs

@@ -144,7 +144,7 @@ impl Statement<'_> {
     /// sure that current statement has already been stepped once before
     /// calling this method.
     #[cfg(feature = "column_decltype")]
-    pub fn columns(&self) -> Vec<Column> {
+    pub fn columns(&self) -> Vec<Column<'_>> {
         let n = self.column_count();
         let mut cols = Vec::with_capacity(n);
         for i in 0..n {

crates/duckdb/src/row.rs

@@ -343,7 +343,7 @@ impl<'stmt> Row<'stmt> {
         Self::value_ref_internal(row, col, column)
     }
 
-    pub(crate) fn value_ref_internal(row: usize, col: usize, column: &ArrayRef) -> ValueRef {
+    pub(crate) fn value_ref_internal(row: usize, col: usize, column: &ArrayRef) -> ValueRef<'_> {
         if column.is_null(row) {
             return ValueRef::Null;
         }