Bump actions/checkout from 5 to 6 (#4628)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/auto_tag_stable.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Checkout code
         if: steps.check_branch.outputs.run == 'true'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Tag
         if: steps.check_branch.outputs.run == 'true'

.github/workflows/clang_linux.yml

@@ -42,7 +42,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache
         uses: actions/cache@v4

.github/workflows/clang_static_analyzer.yml

@@ -22,7 +22,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run
         run: .github/workflows/clang_static_analyzer/start.sh

.github/workflows/code_checks.yml

@@ -22,7 +22,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Requirements
         run: |
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Requirements
         run: |
@@ -69,7 +69,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Detect missing includes
         run: ./scripts/detect_missing_include.sh
@@ -78,7 +78,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Requirements
         run: |
@@ -95,6 +95,6 @@ jobs:
   linting:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
       - uses: pre-commit/[email protected]

.github/workflows/codeql.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/conda.yml

@@ -30,7 +30,7 @@ jobs:
       GHA_CI_PLATFORM: ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: conda-incubator/setup-miniconda@v3
       with:

.github/workflows/coverity-scan.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-22.04
     if: github.repository == 'OSGeo/PROJ'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Libraries
         run: |

.github/workflows/doc_checks.yml

@@ -24,7 +24,7 @@ jobs:
     container: ghcr.io/osgeo/proj-docs
 
     steps:
-    - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v4.1.7
+    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v4.1.7
 
     - name: Update sphinx-rtd-theme
       shell: bash -l {0}

.github/workflows/docker.yml

@@ -43,7 +43,7 @@ jobs:
       PUSH_PACKAGES: ${{ github.repository_owner == 'OSGeo' && github.event_name != 'pull_request' && (matrix.container == 'proj' || (matrix.container == 'proj-docs' && github.ref_name == 'master')) }}
       CONTAINER: ${{ matrix.container }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Lint
         id: lint
         run: |

.github/workflows/fedora_rawhide.yml

@@ -22,7 +22,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache
         uses: actions/cache@v4