gpui: Pin to font-kit with improved OTC parsing performance.

[osiewicz]

Details are in zed-industries/font-kit#1; We're not doing anything too fancy, really. Still, you should mostly see font loading times drop significantly for font collections
Fixes Z-2578
Release Notes:

• Improved loading performance of large font collections (e.g. Iosevka). Fixes MacOS startup time is so slow #6205, Some font configurations make zed completely unresponsive. #5554

Screen.Recording.2024-01-15.at.12.53.40.mov

[linear]

Z-2578 Zed launches very slow for user

#6205

The user's log has:

2023-07-10T01:34:46 [INFO] ========== starting zed ==========
2023-07-10T01:34:46 [INFO] Opening main db
2023-07-10T01:34:46 [INFO] set environment variables from shell:/opt/homebrew/bin/fish, path:/usr/local/opt/openjdk/bin:/nix/var/nix/profiles/default/bin:/usr/local/bin:/opt/homebrew/sbin:/usr/local/sbin:/opt/homebrew/opt/openjdk/bin:/opt/homebrew/opt/mysql-client/bin/:/opt/homebrew/opt/libpq/bin:/opt/homebrew/bin:/Users/opcode/.composer/vendor/bin:/usr/local/bin:/Applications/IntelliJ IDEA.app/Contents/MacOS:/Users/opcode/.krew/bin:/Users/opcode/Applications:/Users/opcode/yandex-cloud/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Applications/Little Snitch.app/Contents/Components:/usr/local/opt/go/libexec/bin:/Users/opcode/.cache/gopath/bin
2023-07-10T01:34:51 [INFO] Opening main db
2023-07-10T01:34:56 [WARN] request completed with error: request or operation took longer than the configured timeout time
2023-07-10T01:34:56 [ERROR] crates/copilot/src/copilot.rs:942: error fetching latest release

Caused by:
    0: request or operation took longer than the configured timeout time
    1: [28] Timeout was reached

The line about setting the environment variables is taking 5 seconds.