github: codeql remove downloaded packages [skip ci]

.github/workflows/codeql.yml

@@ -30,6 +30,7 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install --yes bison default-libmysqlclient-dev flex libcurl4-openssl-dev libjansson-dev libhiredis-dev libevent-dev liblua5.1-0-dev libpcre3-dev libncurses5-dev libpq-dev libreadline-dev libssl-dev libunistring-dev libmicrohttpd-dev libxml2-dev pkg-config python3 python3-dev uuid-dev zlib1g-dev
+          sudo apt-get clean
 
       - name: Configure (cpp)
         if: ${{ matrix.language == 'cpp' }}