deps: bump ethermint to v0.8.1

[fedekunze]

• fix: intrarelayer nonce and update contract
• deps: bump ethermint to v0.8.1

[codecov]

Codecov Report

Merging #110 (2fc3ed8) into main (440120d) will decrease coverage by 1.73%.
The diff coverage is 80.82%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   74.47%   72.73%   -1.74%     
==========================================
  Files          22       23       +1     
  Lines        1610     1665      +55     
==========================================
+ Hits         1199     1211      +12     
- Misses        354      400      +46     
+ Partials       57       54       -3     

Impacted Files	Coverage Δ
x/intrarelayer/keeper/utils.go	18.18% <18.18%> (ø)
x/intrarelayer/types/proposal.go	92.38% <80.76%> (-2.62%)	⬇️
x/intrarelayer/keeper/evm.go	72.36% <100.00%> (ø)
x/intrarelayer/keeper/proposals.go	89.88% <100.00%> (+4.98%)	⬆️
x/intrarelayer/types/msg.go	100.00% <100.00%> (ø)
app/tps_counter.go	15.62% <0.00%> (-56.25%)	⬇️