Update awslambdaric requirement in /diff-generator

Updates the requirements on [awslambdaric](https://github.com/aws/aws-lambda-python-runtime-interface-client) to permit the latest version.
- [Release notes](https://github.com/aws/aws-lambda-python-runtime-interface-client/releases)
- [Changelog](https://github.com/aws/aws-lambda-python-runtime-interface-client/blob/main/RELEASE.CHANGELOG.md)
- [Commits](https://github.com/aws/aws-lambda-python-runtime-interface-client/commits)

---
updated-dependencies:
- dependency-name: awslambdaric
  dependency-version: 4.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

diff-generator/requirements.txt

@@ -1,3 +1,3 @@
 requests>=2.31,<3
-awslambdaric>=2.0.7,<5
+awslambdaric>=4.0.0,<5
 boto3>=1.28.70,<2