build(deps): bump vim/bundle/nvim-lspconfig from ff97d37 to a89de2e

Bumps [vim/bundle/nvim-lspconfig](https://github.com/neovim/nvim-lspconfig) from `ff97d37` to `a89de2e`.
- [Release notes](https://github.com/neovim/nvim-lspconfig/releases)
- [Commits](neovim/nvim-lspconfig@ff97d37...a89de2e)

---
updated-dependencies:
- dependency-name: vim/bundle/nvim-lspconfig
  dependency-type: direct:production
...

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