fix(deps): update dependency fs-extra to v6

[renovate]

This Pull Request updates dependency fs-extra from ^5.0.0 to ^6.0.0

Note: This PR was created on a configured schedule ("after 10pm every weekday,before 5am every weekday,every weekend" in timezone Asia/Tokyo) and will not receive updates outside those times.

Release Notes

v6.0.0

Compare Source

• Drop support for Node.js versions 4, 5, & 7 (#​564)
• Rewrite move to use fs.rename where possible (#​549)
• Don't convert relative paths to absolute paths for filter (#​554)
• copy*'s behavior when preserveTimestamps is false has been OS-dependent since 5.0.0, but that's now explicitly noted in the docs (#​563)
• Fix subdirectory detection for copy* & move* (#​541)
• Handle case-insensitive paths correctly in copy* (#​568)

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