[Feature] Bump SDK to v0.39.1

[yun-yeo]

Summary of changes

• https://github.com/cosmos/cosmos-sdk/releases/tag/v0.39.1

Main Changes

• Change vesting account's custom JSON marshaler to amino codec
• REST server --unsafe-cors mode option

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated relevant documentation (docs/)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

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(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[codecov]

Codecov Report

Merging #383 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #383   +/-   ##
========================================
  Coverage    65.88%   65.88%           
========================================
  Files          116      116           
  Lines         5821     5821           
========================================
  Hits          3835     3835           
  Misses        1767     1767           
  Partials       219      219