ci: update actions/cache version in ci.yml (#438)

Update the step actions/cache@v4 in ci.yml

Signed-off-by: Fabio Pinheiro <[email protected]>

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Cache sbt
         uses: coursier/[email protected]
       - name: Cache embedmongo
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.embedmongo
           key: ${{ runner.os }}-embedmongo-4.14.0