I have a question regarding Nim 2.0. and 1.6. branches. I couldn't find the
answer in the blog or on the forum.

What's the update policy with these branches? Are there going to be any more 1.6
releases? What is a security issue is discovered in 1.6.20, will 1.6.22 be
released?

In the blog, 1.6.20 is referred to as LTS but I couldn't find any description of
how long this long term is exactly or what it means specifically for Nim.