The walking animations of axolotls don't change in relation to their movement speed

If an axolotl on land is spawned with its base movement speed set to a value that is higher than its default movement speed, its walking animation remains the same, causing them to look strange when walking.

To reproduce

1. Run the following command:

    /summon minecraft:axolotl ~ ~ ~ {Invulnerable:1,Attributes:[{Base:4.0d,Name:"generic.movement_speed"}]} 

   → The axolotl's walking animation remains the same, causing it to look like it is gliding.