Bump tools/swift-sdk-generator from a3e3c73 to ed6a85b

Bumps [tools/swift-sdk-generator](https://github.com/apple/swift-sdk-generator) from `a3e3c73` to `ed6a85b`.
- [Release notes](https://github.com/apple/swift-sdk-generator/releases)
- [Commits](swiftlang/swift-sdk-generator@a3e3c73...ed6a85b)

---
updated-dependencies:
- dependency-name: tools/swift-sdk-generator
  dependency-version: ed6a85b1fed5036b2cfc0f242c66e08c5c0d45ed
  dependency-type: direct:production
...

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

Author: dependabot[bot]