Fix Browserbase examples

[kacperlukawski]

https://haystack.deepset.ai/integrations/browserbase

The most recent versions of Browserbase seem not to be using project_id anymore. The integration has to be fixed.

TypeError: Browserbase.__init__() got an unexpected keyword argument 'project_id'

[kacperlukawski]

The BrowserbaseFetcher class may be instantiated with browserbase==0.3.6, but not the most recent ones.

[kacperlukawski]

Created an issue in integration repository: browserbase/haystack#1