Update quickstart samples for python 3.14

Author: ShellyAgg

appengine/flexible/hello_world/app.yaml

@@ -17,7 +17,7 @@ env: flex
 entrypoint: gunicorn -b :$PORT main:app
 
 runtime_config:
-  operating_system: ubuntu22
+  operating_system: ubuntu24
 
 # This sample incurs costs to run on the App Engine flexible environment.
 # The settings below are to reduce costs during testing and are not appropriate

appengine/standard_python3/building-an-app/building-an-app-1/app.yaml

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python313
+runtime: python314
 
 handlers:
   # This configures Google App Engine to serve the files in the app's static