build: bump cosmos-sdk to v0.44.3

[dongsam]

Description

closes: #460

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• Targeted PR against correct branch (see CONTRIBUTING.md)
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• Code follows the module structure standards.
• Wrote unit and integration tests
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• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #461 (7049f47) into develop (e0def69) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #461   +/-   ##
========================================
  Coverage    85.49%   85.49%           
========================================
  Files           23       23           
  Lines         2634     2634           
========================================
  Hits          2252     2252           
  Misses         221      221           
  Partials       161      161           

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[hallazzang]

LGTM

[dongsam]

We will hold the merge for a while until we are sure of Gaia v6 Vega's cosmos-sdk version.