Build(deps): Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pythonpackage.yml

@@ -81,7 +81,7 @@ jobs:
     - name: Create test data directory
       run: mkdir -p $HOME/.cache/stanford-crn
     - name: Load test data cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: stanford-crn
       with:
         path: ~/.cache/stanford-crn/
@@ -145,13 +145,13 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Load test data cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: stanford-crn
       with:
         path: ~/.cache/stanford-crn/
         key: data-v0-${{ github.ref_name }}-${{ github.sha }}
     - name: Load TemplateFlow cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: templateflow
       with:
         path: ~/.cache/templateflow
@@ -218,13 +218,13 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Load test data cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: stanford-crn
       with:
         path: ~/.cache/stanford-crn/
         key: data-v0-${{ github.ref_name }}-${{ github.sha }}
     - name: Load TemplateFlow cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: templateflow
       with:
         path: ~/.cache/templateflow