fix(scheduler-targets): update kinesis firehose imports

[gracelu0]

Issue # (if applicable)

Closes #.

Reason for this change

The Kinesis Firehose module is now stabilized, need to update package imports accordingly.

Description of changes

Fix import paths for Kinesis Firehose target

Describe any new or updated permissions being added

n/a

Description of how you validated changes

Updated integration test

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[xazhao]

LTGM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (183556d) to head (fdaf127).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33615   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files         119      119           
  Lines        6876     6876           
  Branches     1162     1162           
=======================================
  Hits         5653     5653           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.21% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.21% <ø> (ø)

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: fdaf127
• Result: SUCCEEDED
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