Update bsp_buildings.yml

Author: supperthomas

.github/workflows/bsp_buildings.yml

@@ -422,10 +422,10 @@ jobs:
           echo "export PATH=~/.env/tools/scripts:$PATH" > ~/.env/env.sh
       - name: Cache GCC Arm Toolchain
         id: cache-gcc-arm
-        uses: actions/cache@v4
+        uses: actions/cache@main
         with:
           path: /opt/gcc-arm-none-eabi-10-2020-q4-major
-          key: gcc-arm-none-eabi-10-2020-q4-major
+          key: ${{ runner.os }}-arm-none-eabi-10-2020-q4-major
       - name: Install Arm ToolChains
         if: ${{ matrix.legs.RTT_TOOL_CHAIN == 'sourcery-arm' && success() && (steps.cache-gcc-arm.outputs.cache-hit != 'true') }}
         shell: bash