fix: move airflow to 2.6.3 for securty updates

airflow/Dockerfile

@@ -22,7 +22,7 @@ RUN apt -y update && apt-get -y install software-properties-common && \
     rm -rf /var/lib/apt/lists
 
 # install airflow
-RUN pip install "apache-airflow[celery,crypto,hashicorp,password,postgres,redis]==2.5.1" --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-2.5.1/constraints-3.10.txt"
+RUN pip install "apache-airflow[celery,crypto,hashicorp,password,postgres,redis]==2.6.3" --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-2.6.3/constraints-3.10.txt"
 # install train container library
 RUN pip install --force-reinstall --no-cache-dir -v "pht-train-container-library==2.0.5"
 
@@ -43,4 +43,3 @@ RUN apt-get remove -y libcurl3-gnutls && \
 
 ENTRYPOINT ["/root/entrypoint.sh"]
 CMD ["webserver"]
-