Update Dockerfile

Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:latest
 # Update libraries.
 RUN apt update && apt upgrade -y
 # Install needed libraries.
-RUN apt install -y git build-essential libgmp-dev libmpfr-dev libssl-dev libgtest-dev gdb cmake
+RUN apt install -y git build-essential libgmp-dev libmpfr-dev libssl-dev gdb cmake
 # Clean up.
 RUN apt clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*