chore: release v6.4.0

[RiccardoM]

Description

This PR prepares the codebase for the next v6.4.0 release.

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and please add links to any relevant follow up issues.

I have...

• [x] included the correct type prefix in the PR title
• [ ] added ! to the type prefix if API or client breaking change
• [x] targeted the correct branch (see PR Targeting)
• [ ] provided a link to the relevant issue or specification
• [x] followed the guidelines for building modules
• [x] included the necessary unit and integration tests
• [x] added a changelog entry to CHANGELOG.md
• [x] included comments for documenting Go code
• [x] updated the relevant documentation or specification
• [x] reviewed "Files changed" and left comments if necessary
• [x] confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add your handle next to the items reviewed if you only reviewed selected items.

I have...

• [ ] confirmed the correct type prefix in the PR title
• [ ] confirmed ! in the type prefix if API or client breaking change
• [ ] confirmed all author checklist items have been addressed
• [ ] reviewed state machine logic
• [ ] reviewed API design and naming
• [ ] reviewed documentation is accurate
• [ ] reviewed tests and test coverage
• [ ] manually tested (if applicable)

[github-actions[bot]]

👀 Docs preview available here: https://65786fc256128f68dcb6e095--desmos-docs.netlify.app

[codecov[bot]]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (a7bf88f) 81.49% compared to head (ead238f) 81.46%. Report is 1 commits behind head on master.

Files	Patch %	Lines
x/profiles/types/models_packets.go	25.00%	6 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1278 +/- ## ========================================== - Coverage 81.49% 81.46% -0.04% ========================================== Files 218 218 Lines 18274 18287 +13 ========================================== + Hits 14893 14897 +4 - Misses 2772 2778 +6 - Partials 609 612 +3 ```

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