Bump sdk, tendermint version of liquidity module

[dongsam]

Closes: #XXX

Description

As the versions of Cosmos-SDK and Tendermint became v0.42.6 and v0.34.11 in PR #889, we updated the version of the Liquidity module to the corresponding version dependency.

Gravity-Devs/liquidity@v1.2.8...v1.2.9

Follow-up after #859

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For contributor use:

• 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

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #891 (b05bae1) into main (9ee67d7) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #891   +/-   ##
=====================================
  Coverage   0.39%   0.39%           
=====================================
  Files          7       7           
  Lines        505     505           
=====================================
  Hits           2       2           
  Misses       502     502           
  Partials       1       1