Prepare v1.9.4 release: Increase version and update changelog

[koletzilla]

Prepare changes for v1.9.4 release

[windsurf-bot]

Looks good to me 🤙

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[pkotikalapudi]

@mshustov , @koletzilla do you think this fix can go in this release?

[koletzilla]

@mshustov , @koletzilla do you think this fix can go in this release?

Sorry @pkotikalapudi, I'd like to do a good review to your PR to publish it ASAP, but I'm not going to be able to do it for this release. We already have several PRs for v1.9.4 that need to be merged for other issues and we'd like to release the this version with all of them included. I'll work on it to include it in v1.9.5

[koletzilla]

I have been doing some testing today of the new 1.9.4 version and I have found two issues that needs to be fixed before merging it:

• Fix situation when a view full-refresh may remove another view if that view has '_mv' as suffix #536 An error related to the new functionality to remove the internal MV created by the models with materialization: materialized_view
• Use stable version of dbt-adapters #537 I just realised that the dbt-adapter version I added is not considered stable yet, So setting back the version that is in the stable branch.

I have also found a couple of other two issues that I'd like to investigate. I'll update this PR with the details soon.