Pin to @octokit/webhooks version ~13.4.3

[simonbs]

This addresses an issue where a recent update to octokit/webhooks.js has caused the build to start failing.

The problem seems to stem from Octokit's chain of dependencies, so for now we'll pin to version 13.4.x.

❯ npm run build

> framna-docs@1.0.0 build
> next build

  ▲ Next.js 14.2.23
  - Environments: .env.local

   Creating an optimized production build ...
Failed to compile.

./node_modules/@octokit/webhooks/dist-bundle/index.js
Attempted import error: 'verifyWithFallback' is not exported from '@octokit/webhooks-methods' (imported as 'verifyWithFallback').

Import trace for requested module:
./node_modules/@octokit/webhooks/dist-bundle/index.js
./node_modules/@octokit/app/dist-web/index.js
./node_modules/octokit/dist-bundle/index.js
./src/common/github/GitHubClient.ts
./src/common/github/index.ts
./src/common/index.ts
./src/features/projects/view/ProjectsContextProvider.tsx

> Build failed because of webpack errors

[Copilot]

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[simonbs]

This also addresses the failing checks in #485.