Address yarn warnings

[ThatOneCalculator]

When running yarn install these are the resolution warnings:

➤ YN0000: ┌ Resolution step
➤ YN0061: │ chokidar@npm:2.1.8 is deprecated: Chokidar 2 does not receive security updates since 2019. Upgrade to chokidar 3 with 15x fewer dependencies
➤ YN0032: │ fsevents@npm:2.1.3: Implicit dependencies on node-gyp are discouraged
➤ YN0061: │ fsevents@npm:2.1.3 is deprecated: "Please update to latest v2.3 or v2.2"
➤ YN0061: │ fsevents@npm:1.2.13 is deprecated: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
➤ YN0061: │ source-map-resolve@npm:0.5.3 is deprecated: See https://github.com/lydell/source-map-resolve#deprecated
➤ YN0032: │ nan@npm:2.15.0: Implicit dependencies on node-gyp are discouraged
➤ YN0061: │ urix@npm:0.1.0 is deprecated: Please see https://github.com/lydell/urix#deprecated
➤ YN0061: │ resolve-url@npm:0.2.1 is deprecated: https://github.com/lydell/resolve-url#deprecated
➤ YN0061: │ source-map-url@npm:0.4.0 is deprecated: See https://github.com/lydell/source-map-url#deprecated
➤ YN0061: │ flatten@npm:1.0.3 is deprecated: flatten is deprecated in favor of utility frameworks such as lodash.
➤ YN0061: │ browserslist@npm:1.7.7 is deprecated: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
➤ YN0061: │ svgo@npm:0.7.2 is deprecated: This SVGO version is no longer supported. Upgrade to v2.x.x.
➤ YN0002: │ misskey@workspace:. doesn't provide eslint (paec41), requested by @typescript-eslint/parser

each of these should eventually be addressed.

[ThatOneCalculator]

Upgrading Chokidar, Browserslist and SVGO should fix the other issues.