force update index

Author: gbr1

.github/workflows/ci.yml

@@ -35,6 +35,8 @@ jobs:
             curl -fsSL https://www.pjrc.com/teensy/package_teensy_index.json -o /github/home/.arduino15/package_teensy_index.json
             curl -fsSL https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json -o /github/home/.arduino15/package_seeeduino_boards_index.json
             export PATH=$PATH:/github/workspace/bin:/__w/micro_ros_arduino/micro_ros_arduino/bin
+            arduino-cli core update-index
+
             arduino-cli core install OpenCR:OpenCR -v
             arduino-cli core install arduino:samd -v
             arduino-cli core install arduino:sam -v