#21785 add wget as fallback option to curl

What does this PR do?

I added the ability to download bun via either curl or wget to the install.sh script. I am working on a restricted system without root privileges and development libraries, so installing curl would be a lot of work for me.

How did you verify your code works?

I ran the install.sh script in an environment lacking curl and in an environment containing curl. Both options worked.