Upgrade to ESP-IDF release/v6.0 and remove usb component dependency

ESP-IDF release/v6.0 removed the 'usb' component from core - USB PHY
functionality is now handled internally by esp_hw_support.

Changes:
- Remove 'usb' from REQUIRES in main/CMakeLists.txt
- Remove obsolete esp_tinyusb workaround code
- Update GitHub Actions workflows to use release-v6.0
- Matches local development environment

esp_tinyusb v2.0.0 works correctly with release/v6.0 without the
workaround since the component's dependencies are resolved transitively.

Author: RobertDaleSmith

.github/workflows/build-esp32.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Build ${{ matrix.board.display_name }}
         uses: espressif/esp-idf-ci-action@v1
         with:
-          esp_idf_version: 1bbf04cb4c
+          esp_idf_version: release-v6.0
           target: esp32s3
           path: esp
           command: |

.github/workflows/release.yml

@@ -174,7 +174,7 @@ jobs:
       - name: Build ${{ matrix.board.display_name }}
         uses: espressif/esp-idf-ci-action@v1
         with:
-          esp_idf_version: 1bbf04cb4c
+          esp_idf_version: release-v6.0
           target: esp32s3
           path: esp
           command: |

esp/main/CMakeLists.txt

@@ -8,11 +8,4 @@ idf_component_register(SRCS "usb_dfu.c" "ble_hid.c" "transport_hid.c" "transport
                        INCLUDE_DIRS "."
                                     "mouthpad-proto/nanopb"
                                     "mouthpad-proto/src/C"
-                       REQUIRES bt esp_hid nvs_flash esp_driver_uart usb)
-
-# Workaround for esp_tinyusb v2.0.1 bug: CMakeLists.txt has backwards logic for IDF 6.0
-# It only adds "usb" component for IDF < 6, but IDF 6.0+ is what requires it
-# Force esp_tinyusb to link against usb component
-idf_component_get_property(esp_tinyusb_lib espressif__esp_tinyusb COMPONENT_LIB)
-idf_component_get_property(usb_lib usb COMPONENT_LIB)
-target_link_libraries(${esp_tinyusb_lib} PRIVATE ${usb_lib})
+                       REQUIRES bt esp_hid nvs_flash esp_driver_uart)