Build(deps): Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-gcc9.yml

@@ -21,7 +21,7 @@ jobs:
           sudo apt-get install -y gcc-9 build-essential gettext autoconf
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install opensource COBOL 4J
         run: |

.github/workflows/build.yml

@@ -51,7 +51,7 @@ jobs:
           dnf install -y java-21-amazon-corretto-devel gcc make autoconf diffutils gettext tar gzip bison flex
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v5

.github/workflows/check-missing-javadoc.yml

@@ -26,7 +26,7 @@ jobs:
           sudo apt-get install -y gcc-9 build-essential gettext autoconf
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install opensource COBOL 4J
         run: |

.github/workflows/check-workflows.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps: 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install actionlint
         run: |

.github/workflows/coverage.yml

@@ -26,7 +26,7 @@ jobs:
           sudo apt-get install -y build-essential gettext autoconf bison flex gcovr
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install opensource COBOL 4J
         run: |

.github/workflows/create-release.yml

@@ -24,7 +24,7 @@ jobs:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Create a Release
       run: gh release create ${{ github.ref }} -F ReleaseNote.md
@@ -53,7 +53,7 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: |
           cd ../
           mv opensourcecobol4j/* .

.github/workflows/javadoc.yml

@@ -16,7 +16,7 @@ jobs:
           java-version: '21'
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run javadoc
         working-directory: libcobj

.github/workflows/static-analysis.yml

@@ -13,7 +13,7 @@ jobs:
       image: almalinux:9
     steps:
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v5
         with:

.github/workflows/update-github-pages.yml

@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v5
         with:

.github/workflows/windows-build.yml

@@ -24,7 +24,7 @@ jobs:
         uses: microsoft/setup-msbuild@v2.0.0
 
       - name: Checkout opensource COBOL 4J
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Restore NuGet packages
         run: nuget restore ./win/