cache v4

Author: mcb5637

.github/workflows/code_testing.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Cache conan data
         id: cache-conan
-        uses: actions/cache@v4.0.2
+        uses: actions/cache@v4
         with:
           path: ~/.conan2/p
           key: ${{ matrix.config.os }}-${{ matrix.config.compiler }}