Updates for ESP-IDF 5.4.2

[jboynes]

Thanks for providing this demo.

I had some build errors compiling with the current stable verison of ESP-IDF, v5.4.2, and had to make some changes to accommodate. Providing this PR in case it's helpful.

Changes were:

• Update versions
• Remove mio_unsupported_force_poll_poll as I believe esp32 is now supported
• Make build.rs use embuild::espidf::sysenv::output(); to match training library
• Use esp toolchain channel rather than nightly
• Remove esp_add_desc as it seems to conflict with reproducible builds
• Add wifi parameter to closures in connect loop

Tested on macOS against ESP-RUST DevKit (esp32c3)