Add ESP32_Host_MIDI to repositories.txt (#5898)

This commit adds the ESP32_Host_MIDI library to the Arduino Library Manager registry.

Repository URL: https://github.com/seu-usuario/ESP32_Host_MIDI

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Author: sauloverissimo

repositories.txt

@@ -7769,3 +7769,4 @@ https://github.com/johnosbb/hx1838decoder
 https://github.com/RyLeeHarrison/EventEmitter
 https://github.com/CMB27/ModbusTCPComm
 https://github.com/CMB27/ModbusTCPSlave
+https://github.com/sauloverissimo/ESP32_Host_MIDI