Merge pull request #1923 from zeromq/dependabot/github_actions/action…

…s/cache-4

Bump actions/cache from 3 to 4

.github/workflows/test.yml

@@ -109,7 +109,7 @@ jobs:
 
       # preserve pip cache to speed up installation
       - name: Cache pip
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           # Look to see if there is a cache hit for the corresponding requirements file