Bump tools/swift-sdk-generator from 7d1798e to 1a5e7c8

Bumps [tools/swift-sdk-generator](https://github.com/apple/swift-sdk-generator) from `7d1798e` to `1a5e7c8`.
- [Commits](swiftlang/swift-sdk-generator@7d1798e...1a5e7c8)

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

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

Author: dependabot[bot]