feat: v6 upgrade (#225)

## Description

Closes: #XXXX

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### Author Checklist

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I have...

- [ ] included the correct [type
prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json)
in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR
Targeting](https://github.com/milkyway-labs/milkyway/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building
modules](https://docs.cosmos.network/v0.44/building-modules/intro.html)
- [ ] included the necessary unit and integration
[tests](https://github.com/milkyway-labs/milkyway/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go
code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

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I have...

- [ ] confirmed the correct [type
prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json)
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)

ante/ante.go

@@ -4,7 +4,7 @@ import (
 	feemarketante "github.com/skip-mev/feemarket/x/feemarket/ante"
 	feemarketkeeper "github.com/skip-mev/feemarket/x/feemarket/keeper"
 
-	milkywayerrors "github.com/milkyway-labs/milkyway/v5/types/errors"
+	milkywayerrors "github.com/milkyway-labs/milkyway/v6/types/errors"
 
 	ibcante "github.com/cosmos/ibc-go/v8/modules/core/ante"
 	ibckeeper "github.com/cosmos/ibc-go/v8/modules/core/keeper"