build: bump cosmos-sdk to v0.44.6

[dongsam]

Description

closes: #474

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• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #475 (db26422) into release/v1.4.x (44ecf40) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release/v1.4.x     #475   +/-   ##
===============================================
  Coverage           85.49%   85.49%           
===============================================
  Files                  23       23           
  Lines                2634     2634           
===============================================
  Hits                 2252     2252           
  Misses                221      221           
  Partials              161      161           

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[jaybxyz]

Cosmos SDK v0.44.6 doesn't seem to contain anything that affects the liquidity module. LGTM!