chore: use correct team name for PR reviewer assignment

[mrgrain]

The issue-label-assign workflow was failing on PRs because it tried to request reviews from the aws-cdk-owners team, which is not a collaborator on this repository. Updated to use aws-cdk-core-team instead.

Checklist

• This change contains a major version upgrade for a dependency and I confirm all breaking changes are addressed
  • Release notes for the new version:

---

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

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

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

Package	Version	License	Issue Type
aws-github-ops/aws-issue-triage-manager	701b2b0b4ba8c03c587149c37519052c357a2a61	Null	Unknown License

OpenSSF Scorecard

Package	Version	Score	Details
actions/aws-github-ops/aws-issue-triage-manager	701b2b0b4ba8c03c587149c37519052c357a2a61	Unknown	Unknown

Scanned Files

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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.10%. Comparing base (82a8a3c) to head (65552e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1488   +/-   ##
=======================================
  Coverage   88.10%   88.10%           
=======================================
  Files          74       74           
  Lines       10669    10669           
  Branches     1457     1457           
=======================================
  Hits         9400     9400           
  Misses       1241     1241           
  Partials       28       28           

Flag	Coverage Δ
suite.unit	88.10% <ø> (ø)

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