Deprecated github actions in week three content

[iwhalen]

Summary

The actions/upload-artifact and actions/download-artifact v3 endpoints have been eliminated as of January 30th, 2025.

See here for more.

Fix

Update the following lines to the v4 endpoints.

python-on-aws-course/section-2--rest-apis/4--api-contracts-and-docs/desired-state/.github/workflows/build-test-publish.yaml

Line 70 in a684ae4

uses: actions/upload-artifact@v3

python-on-aws-course/section-2--rest-apis/4--api-contracts-and-docs/desired-state/.github/workflows/build-test-publish.yaml

Line 86 in a684ae4

uses: actions/download-artifact@v3

python-on-aws-course/section-2--rest-apis/4--api-contracts-and-docs/desired-state/.github/workflows/build-test-publish.yaml

Line 115 in a684ae4

uses: actions/download-artifact@v3