Merge branch 'ign-gazebo6' into scpeters/merge_6_7_part2

Author: scpeters

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     name: Ubuntu Focal CI
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - uses: actions/setup-python@v3
       - uses: pre-commit/action@v3.0.0
         with:
@@ -25,7 +25,7 @@ jobs:
     name: Ubuntu Jammy CI
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - uses: actions/setup-python@v3
       - uses: pre-commit/action@v3.0.0
         with: