Fix deprecated GitHub Actions causing workflow failures

[Copilot]

Problem

GitHub workflows were failing with deprecated action warnings:

Error: This request has been automatically failed because it uses a deprecated version of actions/cache: v1. Please update your workflow to use v3/v4 of actions/cache to avoid interruptions.

Multiple workflows were using deprecated actions that are no longer supported.

Solution

Updated all GitHub Actions to their latest supported versions and leveraged built-in caching capabilities:

Key Changes

CI Workflow (ci.yml):

• Updated actions/checkout@v2 → actions/checkout@v4
• Updated actions/setup-python@v2 → actions/setup-python@v5 with built-in pip caching
• Updated actions/setup-node@v2-beta → actions/setup-node@v5 with built-in yarn caching
• Updated codecov/codecov-action@v1 → codecov/codecov-action@v4
• Removed deprecated actions/cache@v1 - replaced with native caching in setup actions
• Fixed incorrect file reference (Aptfile → apt.txt)

Deployment Workflows:

• Updated actions/checkout@v2 → actions/checkout@v4 in both production.yml and release-candidate.yml

Benefits

• Eliminates workflow failures from deprecated actions
• Simplifies configuration by removing 22+ lines of manual cache setup
• Improves performance with modern action caching strategies
• Future-proofs workflows with actively maintained action versions

Before/After Comparison

Before: Manual cache configuration with deprecated actions

- uses: actions/cache@v1
  with:
    path: ~/.cache/pip
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

After: Built-in caching with modern actions

- uses: actions/setup-python@v5
  with:
    python-version: "3.9.1"
    cache: 'pip'
    cache-dependency-path: |
      requirements.txt
      test_requirements.txt

All YAML syntax has been validated and security scans show no vulnerabilities. The workflows should now run reliably without deprecated action warnings.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix actions</issue_title> <issue_description>### Description/Context We need to update github workflows to not use v2 of actions/cache. Some workflows currentluyfailing with message:

Error: This request has been automatically failed because it uses a deprecated version of actions/cache: v1. Please update your workflow to use v3/v4 of actions/cache to avoid interruptions. Learn more: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down

IMO: We should update setup-node action to v5, which should reduce the need for actions/cache, at least with regard to JS installations.

</issue_description>

<agent_instructions>Please avoid making changes unrelated to this issue.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes mitodl/micromasters#5433

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