update to tm v0.23.1

[ebuchman]

• fixes unbounded WAL growth

Ref: tendermint/tendermint#2259

Tendermint PR: tendermint/tendermint#2261

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #2126 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2126   +/-   ##
=======================================
  Coverage   63.76%   63.76%           
=======================================
  Files         113      113           
  Lines        6671     6671           
=======================================
  Hits         4254     4254           
  Misses       2131     2131           
  Partials      286      286

[zmanian]

Verified by multiple users on gaia-8001 that cs.wal stabilizes ~1gb

[cwgoes]

utACK