Meta: Update to parcel v2

[fregante]

Depends on parcel-bundler/parcel#5304

❯ parcel-pr-5304-cli build source/manifest.json --no-minify
✨ Built in 7.53s

dist/manifest.json                                   782 B    241ms
dist/github-notifications-preview.9b915661.css     4.39 KB    1.01s
dist/options-storage.js                           40.23 KB    1.02s
dist/github-notifications-preview.js              22.76 KB    1.02s
dist/icon-128.6d4f4520.png                         1.26 KB    310ms
dist/options.html                                    864 B    912ms
dist/options.34975271.css                          1.69 KB    874ms
dist/options.3ed58f63.js                             141 B    880ms

[fregante]

Parcel v1

✨  Built in 3.99s.

dist/options-storage.js                  31.32 KB    2.73s
dist/github-notifications-preview.js     24.45 KB    2.81s
dist/github-notifications-preview.css      4.6 KB    2.66s
dist/webext-base.f655f105.css             1.73 KB    2.03s
dist/options.7075c809.js                  1.53 KB    2.03s
dist/icon-128.png                         1.26 KB    1.50s
dist/options.html                           868 B    1.61s
dist/manifest.json                          745 B    2.00s
Successfully compiled 7 files with Babel (908ms).

Parcel v2

✨ Built in 2.13s

dist/manifest.json                          751 B     98ms
dist/github-notifications-preview.css      4.6 KB    214ms
dist/options-storage.js                  33.49 KB    216ms
dist/github-notifications-preview.js     29.35 KB    215ms
dist/icon-128.png                         1.26 KB    114ms
dist/options.html                           864 B    137ms
dist/options.eba36657.css                 2.17 KB    137ms
dist/options.94a4dc9c.js                     64 B    138ms
Successfully compiled 6 files with Babel (734ms).

Glad to see some savings, especially glad to see parcelRequire junk disappearing from options.js (1.53 KB -> 64 B)