update circleci, don't install gcc-8 as gcc-10 is already installed

Author: fe2s

.circleci/config.yml

@@ -58,7 +58,7 @@ jobs:
           name: install Redis
           command: |
             sudo apt-get -y update
-            sudo apt-get install -y gcc-8 g++-8 libssl-dev
+            sudo apt-get install -y libssl-dev
             wget http://download.redis.io/releases/redis-6.0.10.tar.gz
             tar -xzvf redis-6.0.10.tar.gz
             make -C redis-6.0.10 -j`nproc` BUILD_TLS=yes