Upgrade checkout action from v2 to v4

.github/workflows/application_accepted.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Checkout
         if: ${{ !env.ACT }}
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Parse application file
         if: ${{ !env.ACT }}

.github/workflows/check_application_document.yml

@@ -29,7 +29,7 @@ jobs:
       issues: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Parse application file
         id: grant_parser
         uses: w3f/parse-grant-application-action@master

.github/workflows/check_broken_links.yml

@@ -10,7 +10,7 @@ jobs:
   build_and_check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Link Checker
         id: lychee

.github/workflows/codeql.yml

@@ -40,7 +40,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/publish.yml

@@ -11,11 +11,11 @@ jobs:
     name: build and deploy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v2
         with:
           node-version: "18.19.0"
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Publish