Use latest major version of actions/checkout

Author: utgwkk

.github/workflows/deploy.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Set up Python 3.7
       uses: actions/setup-python@v4

.github/workflows/format.yml

@@ -11,6 +11,6 @@ jobs:
     name: Pre-commit checks
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
     - uses: pre-commit/[email protected]

.github/workflows/test.yml

@@ -41,7 +41,7 @@ jobs:
 
     name: ${{ matrix.os }}, Python ${{ matrix.python-version }}, pytest ${{ matrix.pytest-version }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4

README.md

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - uses: actions/setup-python@v4
       with: