build(deps-dev): bump myclabs/deep-copy from 1.12.0 to 1.12.1

Bumps [myclabs/deep-copy](https://github.com/myclabs/DeepCopy) from 1.12.0 to 1.12.1.
- [Release notes](https://github.com/myclabs/DeepCopy/releases)
- [Commits](myclabs/DeepCopy@1.12.0...1.12.1)

---
updated-dependencies:
- dependency-name: myclabs/deep-copy
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]