fix(changelog): Add dotenv-cli as dev dependency

[Dav1dde]

yarn migrate:dev fails because dotenv is not available, dotenv-cli as a dev dependency makes it work.

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
changelog	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 8, 2024 9:22am
develop-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 8, 2024 9:22am
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 8, 2024 9:22am

[codecov]

Bundle Report

Changes will decrease total bundle size by 11 bytes ⬇️

Bundle name	Size	Change
sentry-docs-server	8.25MB	2 bytes ⬇️
sentry-docs-edge-server	253.05kB	3 bytes ⬇️
sentry-docs-client	6.24MB	6 bytes ⬇️