Bump azure/login action to v2

🗣 Description

The azure/login GitHub action allows our publishing workflows to access our code signing certificate from an Azure Key Vault. However, GitHub has deprecated azure/login@v1 due to the end of life of Node.js v16 used by this action. The newer @v2 uses the supported Node.js v20 software and resolves the login issue in our workflows.

💭 Motivation and context

The publish workflows that use the azure/login action are failing as the previous version is now deprecated and causing it the login to fail on execution. Upgrading the action to the latest (v2) resolves the issue. Closes #1049

🧪 Testing

Review the most recent failed Publish and sign Draft Release and Publish public package action results to see the issue and note the deprecation warning.

See successful results of Build and Sign Release workflow on this branch here: https://github.com/cisagov/ScubaGear/actions/runs/9407521339/job/25913440630

✅ Pre-approval checklist

[x] This PR has an informative and human-readable title.
[x] PR targets the correct parent branch (e.g., main or release-name) for merge.
[x] Changes are limited to a single goal - eschew scope creep!
[x] Changes are sized such that they do not touch excessive number of files.
[x] All future TODOs are captured in issues, which are referenced in code comments.
[x] These code changes follow the ScubaGear content style guide.
[x] Related issues these changes resolve are linked preferably via closing keywords.
[x] All relevant type-of-change labels added.
[x] All relevant project fields are set.
[x] All relevant repo and/or project documentation updated to reflect these changes.
[x] Unit tests added/updated to cover PowerShell and Rego changes.
[x] Functional tests added/updated to cover PowerShell and Rego changes.
[x] All relevant functional tests passed.
[x] All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Pre-merge checklist

[x] PR passed smoke test check.
[x] Feature branch has been rebased against changes from parent branch, as needed

Use Rebase branch button below or use this reference to rebase from the command line.
[x] Resolved all merge conflicts on branch
[x] Notified merge coordinator that PR is ready for merge via comment mention

✅ Post-merge checklist

[ ] Feature branch deleted after merge to clean up repository.
[ ] Verified that all checks pass on parent branch (e.g., main or release-name) after merge.

cisagov / ScubaGear