Bump apache-airflow from 2.9.0 to 2.9.1 (#141)

* Bump apache-airflow from 2.9.0 to 2.9.1

Bumps [apache-airflow](https://github.com/apache/airflow) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@2.9.0...2.9.1)

---
updated-dependencies:
- dependency-name: apache-airflow
  dependency-type: direct:production
...

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

Dockerfile

@@ -1 +1 @@
-FROM quay.io/astronomer/astro-runtime:11.2.0-python-3.12
+FROM quay.io/astronomer/astro-runtime:11.4.0-python-3.12

setup.py

@@ -4,7 +4,7 @@
     name="crate-airflow-tutorial",
     packages=find_packages(),
     python_requires=">=3.11",
-    install_requires=["apache-airflow==2.9.0"],
+    install_requires=["apache-airflow==2.9.1"],
     extras_require={
         "develop": [
             "pylint==3.1.0",