Upgrade to runtime v1.19.1

SubSquare has made some updates to their software called Kintsugi. These updates include changes to the way the software works and some improvements. Here are some important things to know:

• They updated the software to work with a newer version of another program called polkadot.
• They made some changes to how long it takes for people to vote and make decisions using the software.
• If you want to learn more about these updates, you can check out some links on the internet.
• These updates won't stop the software from working with other programs that people might already be using.
• If you want to use this new version of Kintsugi, you will need to use a compatible client called v1.17.4.