Update action.yml (#247)

* Update action.yml

.github/workflows/action.yml

@@ -91,7 +91,7 @@ jobs:
         shell: bash
         run: |
           sudo apt-get update
-          sudo apt-get -qq install gcc-multilib libsdl-dev scons
+          sudo apt-get -qq install gcc-multilib libsdl2-dev scons
           echo "RTT_ROOT=${{ github.workspace }}" >> $GITHUB_ENV
           echo "RTT_CC=gcc" >> $GITHUB_ENV