Marshalling bug because func (n *MappingValueNode) toString() Doesn't have case for tag nodes.

[jbutA]

Describe the bug
Local tags for scalar nodes are placed on a new line because toString() for MappingValueNode doesn't have a case for when .value is TagNode

To Reproduce
https://go.dev/play/p/6_AgHpB8WFs

Expected behavior
Relates to function at line 1355 in

go-yaml/ast/ast.go

Line 1355 in 2c6a0e7

func (n *MappingValueNode) toString() string {

If toString() had a case for TagNode and returned
return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String())
(no new line in format string) for when

_, ok := n.Value.(*TagNode); ok

then the node would be marshalled correctly.

Screenshots
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Version Variables

• Go version: 1.23
• go-yaml's Version: 1.14.0

Additional context
Add any other context about the problem here.

[goccy]

ref #401