Update getting_started code-samples

[meili-bot]

This PR is auto-generated. Update the code-samples.meilisearch.yml according to the documentation issue. The api_key field is missing in the instantiation of the client in the getting started samples. Add aSampleMasterKey as the api_key. cURL example:

    curl \
  -X POST 'http://localhost:7700/indexes/movies/documents?primaryKey=id' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer aSampleMasterKey' \
  --data-binary @movies.json

[ahmednfwela]

note that I couldn't find the dart sdk in the getting started section

[brunoocasali]

Yeah @ahmednfwela I'm not sure why it is not showing up :|

[meili-bors[bot]]

Build succeeded:

• integration-tests (dart 3.0.0)
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