Bump actions/checkout from 2 to 3 (#64)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     steps:
 
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up python 
         uses: actions/setup-python@v3
         with:
@@ -36,7 +36,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python 
         uses: actions/setup-python@v3
@@ -67,7 +67,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python 
         uses: actions/setup-python@v3
@@ -98,7 +98,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python 
         uses: actions/setup-python@v3
@@ -129,7 +129,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python 
         uses: actions/setup-python@v3
@@ -162,7 +162,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python 
         uses: actions/setup-python@v3

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/release.yml

@@ -7,7 +7,7 @@ jobs:
       runs-on: ubuntu-latest
       steps:
         - name: Check out repository
-          uses: actions/checkout@v2
+          uses: actions/checkout@v3
 
         - name: Set up python
           uses: actions/setup-python@v3

.github/workflows/update_doc.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up python
         uses: actions/setup-python@v3