chore(deps): update module mvdan.cc/gofumpt to v0.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mvdan.cc/gofumpt	v0.8.0 -> v0.9.1

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Release Notes

mvdan/gofumpt (mvdan.cc/gofumpt)

v0.9.1

Compare Source

This is a bugfix release to address a regression in detecting
comment directives with special characters such as //golangcitest:config_path.

v0.9.0

Compare Source

This release is based on Go 1.25's gofmt, and requires Go 1.24 or later.

A new rule is introduced to "clothe" naked returns for the sake of clarity.
While there is nothing wrong with naming results in function signatures,
using lone return statements can be confusing to the reader.

Go 1.25's ignore directives in go.mod files are now obeyed;
any directories within the module matching any of the patterns
are now omitted when walking directories, such as with gofumpt -w ..

Module information is now loaded via Go's x/mod/modfile package
rather than executing go mod edit -json, which is way faster.
This should result in moderate speed-ups when formatting many directories.

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Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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