chore(deps): bump awscli in /packages/@aws-cdk/lambda-layer-awscli

Bumps [awscli](https://github.com/aws/aws-cli) from 1.25.70 to 1.27.4.
- [Release notes](https://github.com/aws/aws-cli/releases)
- [Changelog](https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst)
- [Commits](aws/aws-cli@1.25.70...1.27.4)

---
updated-dependencies:
- dependency-name: awscli
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/@aws-cdk/lambda-layer-awscli/layer/requirements.txt

@@ -1 +1 @@
-awscli==1.25.70
+awscli==1.27.4