test: zig build thread_spec.lua failure after `vim.text.diff` rename

Problem:
Since renaming `vim.diff` to `vim.text.diff`, `thread_spec.lua` fails in
the zig build. Is `vim.text.diff` not available in the thread context?
Why does it only fail in the zig build?

    FAILED   ./test/functional/lua/thread_spec.lua @ 217: thread vim.* diff
    ./test/functional/lua/thread_spec.lua:229: Expected objects to be the same.
    Passed in:
    (nil)
    Expected:
    (table: 0x7f221d392218) {
      [1] = 'notification'
    E5113: Lua chunk:
      [2] = 'result'
      [3] = {
        [1] = '@@ -1 +1 @@
    -Hello
    +Helli
    ' } }

    stack traceback:
            ./test/functional/lua/thread_spec.lua:229: in function <./test/functional/lua/thread_spec.lua:217>

    FAILED   ./test/functional/lua/thread_spec.lua @ 372: threadpool vim.* work
    ./test/functional/lua/thread_spec.lua:384: Expected objects to be the same.
    Passed in:
    (table: 0x7f2225be2c30) {
      [1] = 'notification'
      [2] = 'result'
     *[3] = {
       *[1] = vim.NIL } }
    Expected:
    (table: 0x7f2225be25c0) {
      [1] = 'notification'
      [2] = 'result'
     *[3] = {
       *[1] = '@@ -1 +1 @@
    -Hello
    +Helli
    ' } }

    stack traceback:
            ./test/functional/lua/thread_spec.lua:384: in function <./test/functional/lua/thread_spec.lua:372>

Solution:
Use `vim._diff` in the test, until a root cause is found.

0 files changed, 0 insertions, 0 deletions