Actions(deps): Bump actions/checkout from 2 to 3 (#337)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up Python
         uses: actions/setup-python@v3
@@ -36,7 +36,7 @@ jobs:
           - "pypy-3.6"
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v3
@@ -59,7 +59,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: codecov/codecov-action@v1
 

.github/workflows/deploy.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: Deploy
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.inputs.tag }}
       - uses: actions/setup-python@v3