Bump @microsoft/sp-lodash-subset from 1.13.0 to 1.15.2

[dependabot[bot]]

Bumps @microsoft/sp-lodash-subset from 1.13.0 to 1.15.2.

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[gavinbarron]

Closed in favor of #1776

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OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

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