Merge pull request #255 from vpython/dependabot/github_actions/actions/cache-4

Bump actions/cache from 3 to 4

Author: mwcraig

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
       run: |
         python -c "from pip._internal.locations import USER_CACHE_DIR; print('::set-output name=dir::' + USER_CACHE_DIR)"
 
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ${{ steps.pip-cache.outputs.dir }}
         key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}