Bump AWSSDK.Lambda from 3.5.9.1 to 3.7.0
Bump AWSSDK.Lambda from 3.5.9.1 to 3.7.0

Bumps [AWSSDK.Lambda](https://github.com/aws/aws-sdk-net) from 3.5.9.1 to 3.7.0.
- [Release notes](https://github.com/aws/aws-sdk-net/releases)
- [Changelog](https://github.com/aws/aws-sdk-net/blob/master/SDK.CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-net/commits/3.7.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
martincostello/alexa-london-travel