build(deps): bump broccoli-merge-trees from 3.0.2 to 4.2.0

[dependabot-preview]

Bumps broccoli-merge-trees from 3.0.2 to 4.2.0.

Changelog

Sourced from broccoli-merge-trees's changelog.

4.2.0

• Use new public location for volta-cli/action
• switch to GH actions
• bump all dependencies

4.1.0

• [Enhancement] add destDir

4.0.0

• [Breaking] Require Node 10 or >= 12
• Use Class Syntax
• Upgrade dependencies

3.0.0

• Upgrade to node-merge-trees ^2.0.0; this reduces code complexity and fixes an obscure bug

• Bump minimum Node version to 6.0.0

2.0.0

• Require Node >= 4

1.2.4

• Revert to version 1.2.1 to restore Node 0.10 compatibility

1.2.3

• Bump merge-trees dependency for Node 4 compatibility

1.2.2

• Extract logic into node-merge-trees package

1.2.1

• Fix typo with cache directory opt-out.

1.2.0

• Opt out of cache directory creation.

1.1.4

• Use heimdalljs for instrumentation and logging

Commits

• 10ab259 release v4.2.0 🎉
• b0b0fea Update README.md
• ae498da update changelog
• f6a0fb1 Merge pull request #81 from broccolijs/GH-Actions
• 0fdc371 Use new public location for volta-cli/action.
• 04087ba Merge pull request #80 from broccolijs/updates
• b4bfed2 switch to GH actions
• 2cf274c bump all dependencies
• 9c02e51 release v4.1.0 🎉
• cf102e7 bump changelog
• Additional commits viewable in compare view

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