Patch release for ESP32 native USB support

This is a patch release containing the following commits:
- esp32: update esp_tinyusb component to v1.7.6
- tools: add an environment variable MICROPY_MAINTAINER_BUILD
- esp32: add IDF Component Lockfiles to git repo
- shared/tinyusb: fix hang from new tx_overwritabe_if_not_connected flag
- shared/tinyusb/mp_usbd_cdc: rewrite USB CDC TX loop
- tools/mpremote: don't apply Espressif DTR/RTS quirk to TinyUSB CDC dev