Update cache action version in CI workflow

Signed-off-by: Luc <8822552+luc-github@users.noreply.github.com>

Author: luc-github

.github/workflows/build-ci.yml

@@ -15,7 +15,7 @@ jobs:
         run: echo "hash=$(md5sum ./.github/ci/idf-setup.sh | awk '{ print $1 }')" >> $GITHUB_OUTPUT
       - name: Cache ESP-IDF
         id: cache-esp-idf
-        uses: actions/cache@v4.0.0
+        uses: actions/cache@v4
         with:
           path: esp-idf
           key: ${{ runner.os }}-esp-idf-${{ steps.idf-setup-hash.outputs.hash }}
@@ -72,4 +72,4 @@ jobs:
             bash ./.github/ci/final-check.sh "$GITHUB_RUN_ID" "failure"
           else
             bash ./.github/ci/final-check.sh "$GITHUB_RUN_ID" "success"
-          fi
+          fi