Update file kubernetes-manifests.yaml

Merge Request Description

This merge request updates the `kubernetes-manifests.yaml` file.

### Changes

- Updated the image of the `emailservice` container to `gcr.io/google-samples/microservices-demo/emailservice:v0.8.1`.
- Updated the image of the `checkoutservice` container to `gcr.io/google-samples/microservices-demo/checkoutservice:v0.8.1`.
- Updated the image of the `recommendationservice` container to `gcr.io/google-samples/microservices-demo/recommendationservice:v0.8.1`.
- Updated the image of the `frontend` container to `gcr.io/google-samples/microservices-demo/frontend:v0.8.1`.
- Updated the image of the `paymentservice` container to `gcr.io/google-samples/microservices-demo/paymentservice:v0.8.1`.
- Updated the image of the `productcatalogservice` container to `gcr.io/google-samples/microservices-demo/productcatalogservice:v0.8.1`.
- Updated the image of the `cartservice` container to `gcr.io/google-samples/microservices-demo/cartservice:v0.8.1`.
- Updated the image of the `loadgenerator` container to `gcr.io/google-samples/microservices-demo/loadgenerator:v0.8.1`.
- Updated the image of the `currencyservice` container to `gcr.io/google-samples/microservices-demo/currencyservice:v0.8.1`.
- Updated the image of the `shippingservice` container to `gcr.io/google-samples/microservices-demo/shippingservice:v0.8.1`.
- Updated the image of the `redis-cart` container to `gcr.io/google-samples/microservices-demo/redis-cart:v0.8.1`.

<!-- AI Skip -->

---

This description was generated for revision bfa328ed using AI