chore: prepare v6.1 release

[robert-zaremba]

Description

• changelog update
• migrator function update

[codecov]

Codecov Report

Merging #2286 (88764c7) into main (7f05ad4) will decrease coverage by 4.91%.
Report is 260 commits behind head on main.
The diff coverage is 83.12%.

❗ Current head 88764c7 differs from pull request most recent head 7d90f8c. Consider uploading reports for the commit 7d90f8c to get more accurate results

@@            Coverage Diff             @@
##             main    #2286      +/-   ##
==========================================
- Coverage   75.38%   70.48%   -4.91%     
==========================================
  Files         100      170      +70     
  Lines        8025    12880    +4855     
==========================================
+ Hits         6050     9079    +3029     
- Misses       1589     3198    +1609     
- Partials      386      603     +217     

Files	Coverage Δ
ante/ante.go	66.66% <100.00%> (+18.45%)	⬆️
ante/fee.go	80.00% <100.00%> (+1.64%)	⬆️
ante/spam_prevention.go	75.92% <ø> (ø)
app/inflation/inflation.go	100.00% <100.00%> (ø)
util/coin/utoken.go	100.00% <100.00%> (ø)
x/incentive/client/tests/suite.go	100.00% <100.00%> (ø)
x/incentive/client/tests/tests.go	100.00% <100.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/genesis.go	92.48% <100.00%> (+79.14%)	⬆️
x/incentive/keeper/bond.go	92.50% <ø> (ø)
... and 45 more

... and 95 files with indirect coverage changes

[EbrahimElbagory]

LGTM