Update k8s deployment image to 1.4.0

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: rockfordlhotka

k8s/deployment.yaml

@@ -28,7 +28,7 @@ spec:
         fsGroup: 1000
       containers:
         - name: calendar-mcp
-          image: docker.io/rockylhotka/calendar-mcp-http:1.3.7
+          image: docker.io/rockylhotka/calendar-mcp-http:1.4.0
           ports:
             - containerPort: 8080
               name: http