x11/alacritty: Update to 0.2.9
Update x11/alacritty to 0.2.9.
Changelog:
https://github.com/jwilm/alacritty/releases/tag/v0.2.5
https://github.com/jwilm/alacritty/releases/tag/v0.2.6
https://github.com/jwilm/alacritty/releases/tag/v0.2.7
https://github.com/jwilm/alacritty/releases/tag/v0.2.8
https://github.com/jwilm/alacritty/releases/tag/v0.2.9