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-mingw.yml

@@ -21,7 +21,7 @@ jobs:
             os: [windows-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Create folders
       run: |

.github/workflows/build-test.yml

@@ -24,7 +24,7 @@ jobs:
       release_id: ${{ steps.create_release.outputs.id }}
       upload_url: ${{ steps.create_release.outputs.upload_url }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       if: github.event_name == 'push'
 
     - name: moordyn_tag_name
@@ -74,7 +74,7 @@ jobs:
             os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: moordyn_version
       id: moordyn_version

.github/workflows/check-version.yml

@@ -9,7 +9,7 @@ jobs:
     name: Check that the version is valid
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: moordyn_version
       id: moordyn_version

.github/workflows/matlab.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Create install folder
         run: |

.github/workflows/mdf_verification.yml

@@ -21,7 +21,7 @@ jobs:
             os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install deps
       run: |

.github/workflows/memcheck.yml

@@ -19,7 +19,7 @@ jobs:
             os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install valgrind
       run: |

.github/workflows/python-wheels-emulated.yml

@@ -75,7 +75,7 @@ jobs:
         rm -rf docs extern source tests
       
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Used to host cibuildwheel
       - uses: actions/setup-python@v6

.github/workflows/python-wheels-test.yml

@@ -24,7 +24,7 @@ jobs:
         os: ${{ fromJSON(inputs.os) }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/python-wheels.yml

@@ -15,7 +15,7 @@ jobs:
         os: [ubuntu-22.04]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Used to host cibuildwheel
       - uses: actions/setup-python@v6
@@ -141,7 +141,7 @@ jobs:
             os: [ubuntu-22.04]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Download artifacts
         uses: actions/download-artifact@v6

.github/workflows/python-wrapper.yml

@@ -24,7 +24,7 @@ jobs:
             os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup Python
       uses: actions/setup-python@v6