Bump @truffle/hdwallet-provider from 2.1.10 to 2.1.15 (#1886)

Bumps [@truffle/hdwallet-provider](https://github.com/trufflesuite/truffle/tree/HEAD/packages/hdwallet-provider) from 2.1.10 to 2.1.15.
- [Release notes](https://github.com/trufflesuite/truffle/releases)
- [Commits](https://github.com/trufflesuite/truffle/commits/@truffle/hdwallet-provider@2.1.15/packages/hdwallet-provider)

---
updated-dependencies:
- dependency-name: "@truffle/hdwallet-provider"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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