chore: update issue-label-assign.yml to add cli-lib-alpha (#30865)

### Issue # (if applicable) - N/A

Closes #<issue number here>-  N/A

### Reason for this change

Update issue-label-assign.yml to add cli-lib-alpha.

### Description of changes

Update issue-label-assign.yml to add cli-lib-alpha.

### Description of how you validated changes

### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

.github/workflows/issue-label-assign.yml

@@ -284,5 +284,6 @@ env:
             {"area":"@aws-cdk/integ-tests","keywords":["integ-tests", "integ"],"labels":["@aws-cdk/integ-tests"]},
             {"area":"@aws-cdk/integ-runner","keywords":["integ-runner"],"labels":["@aws-cdk/integ-runner"]},
             {"area":"@aws-cdk/app-staging-synthesizer-alpha", "keywords":["app-staging-synthesizer", "app-staging-synthesizer-alpha"],"labels":["@aws-cdk/app-staging-synthesizer-alpha"]},
-            {"area":"@aws-cdk/aws-location-alpha", "keywords":["aws-location", "aws-location-alpha"],"labels":["@aws-cdk/aws-location-alpha"]}
+            {"area":"@aws-cdk/aws-location-alpha", "keywords":["aws-location", "aws-location-alpha"],"labels":["@aws-cdk/aws-location-alpha"]},
+            {"area":"@aws-cdk/cli-lib-alpha", "keywords":["cli-lib", "cli-lib-alpha"],"labels":["@aws-cdk/cli-lib-alpha"]}
           ]