Bump apache/airflow in /airflow

Bumps apache/airflow from 2.7.3-python3.10 to 2.8.0-python3.10.

---
updated-dependencies:
- dependency-name: apache/airflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

airflow/Dockerfile

@@ -1,4 +1,4 @@
-FROM apache/airflow:2.7.3-python3.10
+FROM apache/airflow:2.8.0-python3.10
 
 RUN pip install --no-cache-dir apache-airflow-providers-airbyte==2.1.4