Bump apache-airflow-providers-slack from 9.0.0 to 9.5.0

Bumps [apache-airflow-providers-slack](https://github.com/apache/airflow) from 9.0.0 to 9.5.0.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/docker-stack-docs/changelog.rst)
- [Commits](apache/airflow@providers-slack/9.0.0...providers-slack/9.5.0)

---
updated-dependencies:
- dependency-name: apache-airflow-providers-slack
  dependency-version: 9.5.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Pipfile

@@ -5,7 +5,7 @@ verify_ssl = true
 
 [dev-packages]
 apache-airflow = "==2.10.5"
-apache-airflow-providers-slack = "==9.0.0"
+apache-airflow-providers-slack = "==9.5.0"
 boto3 = "==1.36.3"
 moto = "==5.0.11"
 pandas = "==2.1.4"