Fix CI: use ci-arduino@master, exclude hw_tests from clang-format

Author: piclaw

.github/workflows/clang-format.yml

@@ -12,4 +12,4 @@ jobs:
         with:
           clang-format-version: '18'
           check-path: '.'
-          exclude-regex: 'examples/.*'
+          exclude-regex: '(examples|hw_tests)/.*'

.github/workflows/githubci.yml

@@ -10,6 +10,6 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: '3.x'
-      - uses: adafruit/ci-arduino@v1.6.1
+      - uses: adafruit/ci-arduino@master
         with:
-          arduino-platform: 'arduino:avr,adafruit:samd,adafruit:nrf52,esp32:esp32'
+          arduino-platform: 'arduino:avr'