bump core to v1.2.4-tm-v0.35.6

[evan-forbes]

Description

pull all the latest changes from tendermint + our fixes

closes: #XXXX

[rach-id]

LGTM. The CI apparently needs to be restarted.

[evan-forbes]

LGTM. The CI apparently needs to be restarted.

this is actually a bug that I've been digging into the past few hours. I'm not sure exactly what is going on or if its relevant to tendermint, but it doesn't pop up in the previous v0.35. For some reason, when two validators are used in the big block test, they prematurely start new rounds

[evan-forbes]

This is blocked by celestiaorg/celestia-core#783

[codecov-commenter]

Codecov Report

Merging #475 (2dff0b3) into master (1c357cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #475   +/-   ##
=======================================
  Coverage   25.18%   25.18%           
=======================================
  Files          15       15           
  Lines        1930     1930           
=======================================
  Hits          486      486           
  Misses       1401     1401           
  Partials       43       43           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1c357cb...2dff0b3. Read the comment docs.

[evan-forbes]

This is blocked by celestiaorg/celestia-core#783

this isn't the case any longer as we instead changed the default peer gossip timeout, which fixed the failing test mentioned earlier