Bump tools/swift-sdk-generator from 0158a41 to a3e3c73

Bumps [tools/swift-sdk-generator](https://github.com/apple/swift-sdk-generator) from `0158a41` to `a3e3c73`.
- [Release notes](https://github.com/apple/swift-sdk-generator/releases)
- [Commits](swiftlang/swift-sdk-generator@0158a41...a3e3c73)

---
updated-dependencies:
- dependency-name: tools/swift-sdk-generator
  dependency-version: a3e3c73929d2334c4d7fdfeb30e3cc27cdfcc7c6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]