fix: remove redundant symlink from workflow

Not needed, because luajit-openresty build ends up doing this:

    ln -sf luajit-2.1.1723681758 /home/runner/work/command-t/command-t/.lua/bin/luajit
    ==== Successfully installed LuaJIT 2.1.1723681758 to /home/runner/work/command-t/command-t/.lua ====

In fact, the removed step fails because of this:

    ln: failed to create symbolic link 'luajit': File exists

As seen in:

- https://github.com/wincent/command-t/actions/runs/11072400295/job/30766530564

.github/workflows/lua.yml

@@ -33,12 +33,6 @@ jobs:
         with:
           luaVersion: luajit-openresty
 
-      - name: Symlink luajit
-        run: |
-          pushd .lua/bin
-          ln -s lua luajit
-          popd
-
       - name: Build extension (release)
         run: |
           pushd lua/wincent/commandt/lib