Missing peer dependencies in Gatsby package

[aaronadamsCA]

• Review the documentation: https://docs.sentry.io/
• Search for existing issues: https://github.com/getsentry/sentry-javascript/issues
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Package + Version

@sentry/gatsby latest (currently 6.17.6)

Description

@sentry/gatsby is not fulfilling internal peer dependencies:

➤ │ @sentry/gatsby@npm:6.17.6 doesn't provide react (p56d37), requested by @sentry/react
➤ │ @sentry/gatsby@npm:6.17.6 doesn't provide webpack (p0762b), requested by @sentry/webpack-plugin

$ yarn explain peer-requirements p56d37        
➤ @sentry/gatsby@npm:6.17.6 [52132] doesn't provide react, breaking the following requirements:

➤ @sentry/react@npm:6.17.6 [bc2a9] → 15.x || 16.x || 17.x ✘

$ yarn explain peer-requirements p0762b
➤ @sentry/gatsby@npm:6.17.6 [52132] doesn't provide webpack, breaking the following requirements:

➤ @sentry/webpack-plugin@npm:1.18.5 [bc2a9] → ^4.41.31 || ^5.0.0 ✘

I can file a PR to resolve, by adding the missing peer dependencies to the Gatsby package. This is the same solution used in other packages, like Next.js.