vimfiles: bump vimfiles/pack/dist/start/vim-airline from ff7352e to…

… `20a49bd` (#37)

Bumps [vimfiles/pack/dist/start/vim-airline](https://github.com/vim-airline/vim-airline) from `ff7352e` to `20a49bd`.
- [Release notes](https://github.com/vim-airline/vim-airline/releases)
- [Commits](vim-airline/vim-airline@ff7352e...20a49bd)

---
updated-dependencies:
- dependency-name: vimfiles/pack/dist/start/vim-airline
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>