No need for 19

Author: thiagopradi

CONTRIBUTING.md

@@ -25,7 +25,6 @@ Before installing the dependencies, you need to add the LLVM repository and GPG
 
 ```bash
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-sudo add-apt-repository "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-19 main"
 sudo add-apt-repository "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-21 main"
 sudo apt update
 ```