Replace deprecated command with environment file

[jongwooo]

Description

Closes #283

Update .github/workflows/get-releases-weekly.yaml to use environment file instead of deprecated set-output command. For more information, see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

I found the workflow file that use set-output command through the following command:

$ find . -name '*.yml' -o -name '*.yaml' | xargs egrep '\bset-output\b'

AS-IS

run: echo "::set-output name=date::$(date +'%Y-%m-%d')"

TO-BE

run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT

[sreeram-venkitesh]

@mfahlandt would be the right person to review this

[mfahlandt]

tested it and works /lgtm

[k8s-ci-robot]

@mfahlandt: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubernetes-sigs/lwkd/pull/284#issuecomment-1875870445): >tested it and works >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[sreeram-venkitesh]

/lgtm

[jberkus]

/approve

Thanks for the fix!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkus, jongwooo

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