Update actions/checkout action to v4

.github/workflows/chart-lint.yaml

@@ -9,7 +9,7 @@ jobs:
   fleet-symlinks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: azure/[email protected]
 
       - name: Set up Go

.github/workflows/fleet-symlinks.yaml

@@ -9,7 +9,7 @@ jobs:
   fleet-symlinks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Go
         uses: actions/setup-go@v5

.github/workflows/markdownlint.yaml

@@ -9,7 +9,7 @@ jobs:
   markdownlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run mdl
         uses: actionshub/markdownlint@main

.github/workflows/shellcheck.yaml

@@ -9,7 +9,7 @@ jobs:
   shellcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master

.github/workflows/yamllint.yaml

@@ -9,7 +9,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run yamllint
         uses: bewuethr/yamllint-action@v1