which-key v3 update

[VlaDexa]

which-key recently had a v3 update and depreciated the register function, replacing it with an add function.

Also it's a bit more clear now, since there is now no empty map

[zjtalia]

For context, this change matches the suggested fix from :checkhealth which-key:

- WARNING You're using an old version of the which-key spec.
  Your mappings will work, but it's recommended to update them to the new version.
  Please check the docs and suggested spec below for more info.
  Mappings: >
  {
    ["<leader>c"] = {
      _ = "which_key_ignore",
      name = "[C]ode"
    },
    ["<leader>d"] = {
      _ = "which_key_ignore",
      name = "[D]ocument"
    },
    ["<leader>h"] = {
      _ = "which_key_ignore",
      name = "Git [H]unk"
    },
    ["<leader>r"] = {
      _ = "which_key_ignore",
      name = "[R]ename"
    },
    ["<leader>s"] = {
      _ = "which_key_ignore",
      name = "[S]earch"
    },
    ["<leader>t"] = {
      _ = "which_key_ignore",
      name = "[T]oggle"
    },
    ["<leader>w"] = {
      _ = "which_key_ignore",
      name = "[W]orkspace"
    }
  }
  
  -- Suggested Spec:
  {
    { "<leader>c", group = "[C]ode" },
    { "<leader>c_", hidden = true },
    { "<leader>d", group = "[D]ocument" },
    { "<leader>d_", hidden = true },
    { "<leader>h", group = "Git [H]unk" },
    { "<leader>h_", hidden = true },
    { "<leader>r", group = "[R]ename" },
    { "<leader>r_", hidden = true },
    { "<leader>s", group = "[S]earch" },
    { "<leader>s_", hidden = true },
    { "<leader>t", group = "[T]oggle" },
    { "<leader>t_", hidden = true },
    { "<leader>w", group = "[W]orkspace" },
    { "<leader>w_", hidden = true },
  }

[tjdevries]

Thanks!!

[VlaDexa]

We're so back

[rmacklin]

@tjdevries very happy to see PRs getting merged! Anything we can do to help get some of the other PRs moved forward?

I'm especially interested in the ones related to neovim 0.10 - if the main pushback is wanting to allow folks stuck on 0.9 to use kickstart, maybe we could create an 0.9 tag (or branch) that they could use, while allowing the project to embrace 0.10 on master?