Remove unnecessary `_JSObjectProtocol`

The workaround is no longer needed for the latest toolchain.

Merge pull request swiftwasm#261 from swiftwasm/yt/xcode16

Simplify the release workflow

Bump version to 0.20.0, update `CHANGELOG.md`

Bump version to 0.19.3, update `CHANGELOG.md`

Bump version to 0.19.2, update `CHANGELOG.md`

Bump version to 0.19.1, update `CHANGELOG.md`

Bump version to 0.19.0, update `CHANGELOG.md`

Bump version to 0.18.0, update `CHANGELOG.md`

Bump version to 0.17.0, update `CHANGELOG.md`