Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build-mapscript-php.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v2

.github/workflows/build-mapscript-python.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v2

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout repository contents
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set RUN_COVERALLS Environment Variable
         if: (github.event.pull_request.merged == true || github.event_name == 'push') && env.WITH_ASAN != 'true'

.github/workflows/check-crlf.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout repository contents
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Use action to check for CRLF endings
         uses: erclu/[email protected]

.github/workflows/coverity-scan.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository == 'MapServer/MapServer'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Libraries
         run: |

.github/workflows/cppcheck.yml

@@ -16,7 +16,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Requirements
         run: |