CHORE(app): increase memory to 200Mi

- Memory limit: 100Mi -> 200Mi
- Memory request: 50Mi -> 100Mi
- Required for Next.js with sharp package

deploy/k8s/overlays/prod/deployment-patch.yaml

@@ -12,8 +12,8 @@ spec:
         - name: portfolio-app
           resources:
             requests:
-              memory: "50Mi"
+              memory: "100Mi"
               cpu: "50m"
             limits:
-              memory: "100Mi"
+              memory: "200Mi"
               cpu: "150m"