build(deps): bump vim/bundle/nvim-lspconfig from 28b205e to bc6ada4

Bumps [vim/bundle/nvim-lspconfig](https://github.com/neovim/nvim-lspconfig) from `28b205e` to `bc6ada4`.
- [Release notes](https://github.com/neovim/nvim-lspconfig/releases)
- [Commits](neovim/nvim-lspconfig@28b205e...bc6ada4)

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

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