update several github actions to silence github deprecation warnings

[rkuo-danswer]

Description

Fixes DAN-791.

How Has This Been Tested?

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Accepted Risk

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Related Issue(s)

[If applicable, link to the issue(s) this PR addresses]

Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

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internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 9, 2024 0:00am

[greptile-apps]

PR Summary

This pull request aims to update several GitHub Actions to address deprecation warnings. The changes focus on updating GitHub Actions workflows to use newer versions and syntax, improving the CI/CD pipeline's compatibility and reducing potential issues.

• Updated actions/upload-artifact to v4 in .github/workflows/pr-Integration-tests.yml
• Upgraded docker/build-push-action to v6 in .github/actions/custom-build-and-push/action.yml
• Updated actions/download-artifact to v4 in .github/workflows/docker-build-push-web-container-on-tag.yml
• Replaced deprecated set-output command with environment file syntax in various workflows

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