Bump the submodules group with 3 updates

Bumps the submodules group with 3 updates: [nvim/plugins/gitsigns](https://github.com/lewis6991/gitsigns.nvim), [nvim/plugins/nvim-lspconfig](https://github.com/neovim/nvim-lspconfig) and [nvim/plugins/nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter).


Updates `nvim/plugins/gitsigns` from `7178d1a` to `e9c4187`
- [Release notes](https://github.com/lewis6991/gitsigns.nvim/releases)
- [Commits](lewis6991/gitsigns.nvim@7178d1a...e9c4187)

Updates `nvim/plugins/nvim-lspconfig` from `cf97d24` to `216deb2`
- [Release notes](https://github.com/neovim/nvim-lspconfig/releases)
- [Commits](neovim/nvim-lspconfig@cf97d24...216deb2)

Updates `nvim/plugins/nvim-treesitter` from `465840f` to `972aa54`
- [Commits](nvim-treesitter/nvim-treesitter@465840f...972aa54)

---
updated-dependencies:
- dependency-name: nvim/plugins/gitsigns
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: nvim/plugins/nvim-lspconfig
  dependency-type: direct:production
  dependency-group: submodules
- dependency-name: nvim/plugins/nvim-treesitter
  dependency-type: direct:production
  dependency-group: submodules
...

Signed-off-by: dependabot[bot] <[email protected]>