fix: add dependencies on windows

[justicenyaga]

This PR addresses an issue encountered on Windows where plenary fails to execute .bat or .cmd executables. On Windows, these file types require the use of cmd /C or powershell -Command to be executed correctly, but plenary was not accounting for this.

Error Message:

Error executing vim.schedule lua callback: ...ta/Local/nvim-data/lazy/plenary.nvim/lua/plenary/job.lua:406: Failed to spawn process: {
  _additional_on_exit_callbacks = { <function 1>, <function 2> },
  _shutdown_check = <userdata 1>,
  _stderr_results = {},
  _stdout_results = {},
  args = { "pub", "add", "crypto" },
  command = "flutter",
  enable_handlers = true,
  enable_recording = true,
  interactive = true,
  pid = "ENOENT: no such file or directory",
}

Fix

To address this, I modified the execution of commands on Windows to use cmd /C. This ensures that .bat and .cmd files are executed correctly, resolving the issue.