Update dependency com.facebook:ktfmt to v0.51

[slack-oss-bot]

This PR contains the following updates:

Package	Type	Update	Change
com.facebook:ktfmt	dependencies	minor	0.50 -> 0.51

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Release Notes

facebookincubator/ktfmt (com.facebook:ktfmt)

v0.51

Added

• Created CHANGELOG.md
• Added --help option to CLI (https://github.com/facebook/ktfmt/pull/477)

Changed

• Preserves blank spaces between when clauses (https://github.com/facebook/ktfmt/issues/342)
• Named the default style as Formatter.META_FORMAT / --meta-style
• FormattingOptions constructor parameters order was changed

Fixed

• Compilation issues with online formatter (facebook/ktfmt@8605080)
• Removing valid semicolons (https://github.com/facebook/ktfmt/issues/459)
• Incorrect detection of unused assign import (https://github.com/facebook/ktfmt/issues/411)

Removed

• Deleted Formatter.DROPBOX_FORMAT / --dropbox-style (BREAKING CHANGE)
• Deleted FormattingOptions.Style enum

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