Update .gitlab-ci.yml file - universe is already enabled.

.gitlab-ci.yml

@@ -42,7 +42,6 @@ build:ubuntu:
   stage: build
   before_script:
     - apt update && apt install -y build-essential cmake
-    - add-apt-repository -y universe
     - apt install -y libglm-dev libglfw3-dev libopenal-dev libspdlog-dev libfreetype-dev libyaml-cpp-dev libassimp-dev libbullet-dev
   script:
     - cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug