Change is in the air! Untyped zero, coroutines, and improved http.ServeMux.

• Go 1.21RC3 released
• 🎉 loopvar fix has been ACCEPTED! Likely to be included in 1.22
• Blog post: Coroutines for Go by Russ Cox
• 🌐 net/http.serveMux routing improvements is now an official proposal
• 0️⃣ New proposal: add an untyped zero
• Echo 4.11.0 released

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