KTOR-7909 docs: update Linux installation instructions in contributing guide (#4529)

- Replace outdated 'libncurses5' packages with 'libncurses-dev' and 'libtinfo-dev' to ensure compatibility with Ubuntu 20.04 and later.

- Use 'apt' instead of 'apt-get' for modern best practices.

- Simplify installation commands by combining them and removing explicit version numbers.

Author: bsautner

CONTRIBUTING.md

@@ -39,9 +39,8 @@ system you use for development:
 Run the following commands to install `libcurl` and `libncurses`:
 
 ```bash
-sudo apt-get update
-sudo apt-get install libncurses5 libncursesw5 libtinfo5
-sudo apt-get install libcurl4-openssl-dev
+sudo apt update
+sudo apt install libncurses-dev libtinfo-dev libcurl4-openssl-dev
 ```
 
 **macOS**