Changes related to the next Meilisearch release (v1.9.0)

[meili-bot]

Related to this issue: https://github.com/meilisearch/integration-guides/issues/301

This PR:

• gathers the changes related to the next Meilisearch release (v1.9.0) so that this package is ready when the official release is out.
• should pass the tests against the latest pre-release of Meilisearch.
• might eventually contain test failures until the Meilisearch v1.9.0 is out.

⚠️ This PR should NOT be merged until the next release of Meilisearch (v1.9.0) is out.

This PR is auto-generated for the pre-release week purpose.

[meili-bors[bot]]

Build succeeded:

• integration-and-unit-tests
• linter