bump rest of actions/checkout to v3

Author: jepler

.github/workflows/githubci.yml

@@ -10,7 +10,7 @@ jobs:
       with:
         python-version: "3.x"
     - name: Checkout Current Repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: check SPDX licensing
       run: python ./SPDX.py
@@ -26,8 +26,8 @@ jobs:
     - uses: actions/setup-python@v4
       with:
         python-version: "3.x"
-    - uses: actions/checkout@v2
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3
       with:
          repository: adafruit/ci-arduino
          path: ci
@@ -98,7 +98,7 @@ jobs:
       run: |
         pip install --force-reinstall pylint==2.7.1
     - name: Checkout Current Repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: lint
       run: ./pylint_check.sh