chore: Rename v044 migrations to v045

[amaury1093]

Description

In general, migrations in a vX package means that we're migration TO version X.

We added a new denom++address index in #9611, and this should go in 0.45. However, its migration went into package v044 because it was done before the v044 security release. To avoid confusion, I'm renaming that package to v045

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[aleem1314]

LGTM

[codecov]

Codecov Report

Merging #10260 (e7458dc) into master (6f33514) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master   #10260   +/-   ##
=======================================
  Coverage   63.65%   63.65%           
=======================================
  Files         573      573           
  Lines       53816    53816           
=======================================
  Hits        34259    34259           
  Misses      17608    17608           
  Partials     1949     1949           

Impacted Files	Coverage Δ
x/bank/keeper/migrations.go	33.33% <0.00%> (ø)
x/bank/migrations/v045/keys.go	100.00% <ø> (ø)
x/bank/migrations/v045/store.go	75.00% <ø> (ø)