upgrade checkout action to v4 in all workflows (#187)

Author: shaypal5

.github/workflows/checkdocs.yml

@@ -14,7 +14,7 @@ jobs:
   checkdocs:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: actions/checkout@v3.4.0
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4.5.0
         with:

.github/workflows/safety.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: "ubuntu-latest"
     environment: safety_check
     steps:
-      - uses: actions/checkout@v3.4.0
+      - uses: actions/checkout@v4
       - name: Security vulnerabilities scan
         uses: shaypal5/python-safety-checker@v1.0.6
         with:

.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
         backend: ["local", "db"]
 
     steps:
-      - uses: actions/checkout@v3.4.0
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4.5.0