Merge branch 'pj/ci-update-workflows'

* pj/ci-update-workflows:
  ci: setup-python action at v4 now.
  ci: update to avoid deprecated warnings on builds

Author: contrem

.github/workflows/aunit_tests.yml

@@ -5,10 +5,10 @@ on: [push, pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Build
       run: |

.github/workflows/githubci.yml

@@ -7,11 +7,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/setup-python@v1
+    - 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