Update to 1.2.2

Changelog:

• Fixes a critical error where 1 completed future with multiple awaits will cause only 1 await (the last one) to be awakened. Multiple other Minor issues fixed.

Full changelog available here.

Packager Notes:

• Include zsh autocompletion (into site-functions) for nimble.
• To build 1.2.2 we need to remove nim-gdb from install script, since these are missing in the src tarball. See this issue.

check if nimble autocompletion works in zsh and compile 3 example programms from https://nim-lang.org/