Fix deprecated GitHub Actions versions

### Notes

- Update actions/checkout from v2 to v4
- Update actions/setup-python from v2 to v4
- Update actions/cache from v2 to v4 (both instances)

### Testing

This addresses the workflow failure caused by deprecated action versions.
The updated actions are the current stable releases and should resolve
the CI pipeline issues.

### Issues
* Fixes GitHub Actions deprecation warnings in CI workflow

Author: natsirtguy

.github/workflows/test.yml

@@ -22,10 +22,10 @@ jobs:
         python-version: [3.7]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -34,13 +34,13 @@ jobs:
       with:
         version: ${{ matrix.emacs_version }}
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       id: cache-cask-packages
       with:
         path: .cask
         key: cache-cask-packages-001
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       id: cache-cask-executable
       with:
         path: ~/.cask