fix failed release: regenerate the *.mpack file

Set NVIM_API_PRERELEASE=true to regenerate the *.mpack file, because it
was generated from an old binary accidentally, which caused the release
to fail:

    test/functional\api\version_spec.lua:133: Expected objects to be the same.
    Passed in:
    (table: 0x0c6175a8) {
      [method] = false
      [name] = 'nvim_get_context'
     *[parameters] = {
       *[1] = {
         *[1] = 'Dictionary'
          [2] = '' } }
      [return_type] = 'Dictionary'
      [since] = 6 }
    Expected:
    (table: 0x0c6cd2d0) {
      [method] = false
      [name] = 'nvim_get_context'
     *[parameters] = {
       *[1] = {
         *[1] = 'Array'
          [2] = '' } }
      [return_type] = 'Dictionary'
      [since] = 6 }
    stack traceback:
        test/functional\api\version_spec.lua:133: in function <test/functional\api\version_spec.lua:122>

0 files changed, 0 insertions, 0 deletions