🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
     - name: Setup Python
       uses: actions/setup-python@v4
       with:
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
     - name: Setup Python
       uses: actions/setup-python@v4
       with:

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
     - name: Setup Python
       uses: actions/setup-python@v4
       with:

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
         python: ['3.7', '3.8', '3.9', '3.10', '3.11']
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
     - name: Setup Python
       uses: actions/setup-python@v4
       with:
@@ -37,7 +37,7 @@ jobs:
         - unit
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
     - name: Setup Python
       uses: actions/setup-python@v4
       with: