It's "boring" in the sense that it's been around for a while and has proven itself to be fairly stable and reliable, is not going away any time soon, is no long

It's "boring" in the sense that it's been around for a while and has proven itself to be fairly stable and reliable, is not going away any time soon, is no longer changing at a very rapid pace, has some good books written about it. Rust is also fast becoming "boring" in this sense (maybe it already is; I don't keep up that closely). This is opposed to Rust from 5 years ago, or e.g. Zig today. That's how I typically use "boring technology" anyway.