Bump actions/checkout from 2 to 3 (#265)

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -17,7 +17,7 @@ jobs:
     name: Deploy
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
     - uses: actions/setup-python@v3

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v3
       with:
         python-version: '3.x'