Backport velocity field changes from 1.21.9+ to older versions (#1467)

* Add vec3i16 type to packetTest.js

* Update ci.yml

* Update ci.yml

Removed outdated command to clone minecraft-data repository.

---------

Co-authored-by: extremeheat <[email protected]>

Author: SuperGamerTron

test/packetTest.js

@@ -232,6 +232,9 @@ const values = {
   vec3i: {
     x: 0, y: 0, z: 0
   },
+  vec3i16: {
+    x: 0, y: 0, z: 0
+  },
   count: 1, // TODO : might want to set this to a correct value
   bool: true,
   f64: 99999.2222,