Bump @probot/adapter-aws-lambda-serverless from 3.0.4 to 4.0.3 (#773)

Bumps [@probot/adapter-aws-lambda-serverless](https://github.com/probot/adapter-aws-lambda-serverless) from 3.0.4 to 4.0.3.
- [Release notes](https://github.com/probot/adapter-aws-lambda-serverless/releases)
- [Commits](probot/adapter-aws-lambda-serverless@v3.0.4...v4.0.3)

---
updated-dependencies:
- dependency-name: "@probot/adapter-aws-lambda-serverless"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yadhav Jayaraman <[email protected]>

Author: dependabot[bot]