Update TS bindings output for variants (#1180)

Updates our JCO submodule to include the changes in
NomicFoundation/jco#5. Includes one other change to fully integrate
these changes, which is to change `NodeVariant` to `NodeType` in
`codegen/../cst/index.mts` so that the expected imports align with the
new generated exports.

* [x] Depends on #1169
* [x] Depends on NomicFoundation/jco#5

Closes #1166 
Closes #1171

crates/codegen/runtime/npm/package/src/runtime/cst/index.mts

@@ -14,8 +14,8 @@ export type EdgeLabel = generated.cst.EdgeLabel;
 
 export type Node = generated.cst.Node;
 
-export const NodeVariant = generated.cst.NodeVariant;
-export type NodeVariant = generated.cst.NodeVariant;
+export const NodeType = generated.cst.NodeType;
+export type NodeType = generated.cst.NodeType;
 
 export const NonterminalNode = generated.cst.NonterminalNode;
 export type NonterminalNode = generated.cst.NonterminalNode;