Update actions/checkout action

Author: netmindz

.github/workflows/wled-ci.yml

@@ -8,7 +8,7 @@ jobs:
     name: Gather Environments
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Cache pip
       uses: actions/cache@v3
       with:
@@ -38,7 +38,7 @@ jobs:
       matrix:
         environment: ${{ fromJSON(needs.get_default_envs.outputs.environments) }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Cache pip
       uses: actions/cache@v3
       with: