Checkout: Update all workflows to use Checkout V4

Author: jsoref

ci/datadog-synthetics.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     # Run Synthetic tests within your GitHub workflow.
     # For additional configuration options visit the action within the marketplace: https://github.com/marketplace/actions/datadog-synthetics-ci

code-scanning/appknox.yml

@@ -30,7 +30,7 @@ jobs:
   appknox:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:

code-scanning/bandit.yml

@@ -29,7 +29,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Bandit Scan
         uses: shundor/python-bandit-scan@9cc5aa4a006482b8a7f91134412df6772dbda22c
         with: # optional arguments

code-scanning/clj-holmes.yml

@@ -27,7 +27,7 @@ jobs:
       actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Scan code
         uses: clj-holmes/clj-holmes-action@200d2d03900917d7eb3c24fc691ab83579a87fcb

code-scanning/clj-watson.yml

@@ -32,7 +32,7 @@ jobs:
       actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Dependency scan
         uses: clj-holmes/clj-watson-action@39b8ed306f2c125860cf6e69b6939363689f998c

code-scanning/crda.yml

@@ -81,7 +81,7 @@ jobs:
     steps:
 
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       # *******************************************************************
       # Required: Instructions to setup project

code-scanning/neuralegion.yml

@@ -162,7 +162,7 @@ jobs:
     runs-on: ubuntu-18.04
     name: A job to run a Nexploit scan
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Start Nexploit Scan 🏁
         id: start
         uses: NeuraLegion/run-scan@29ebd17b4fd6292ce7a238a59401668953b37fbe