Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-wheels.yml

@@ -14,7 +14,7 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Set up Python
         uses: actions/setup-python@v6

.github/workflows/measure-coverage.yml

@@ -13,7 +13,7 @@ jobs:
       (github.event_name == 'push' && github.repository == 'toruseo/UXsim') ||
       (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && github.repository == 'toruseo/UXsim')
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.13
       uses: actions/setup-python@v6
       with:

.github/workflows/run-examples.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         python-version: ["3.10", "3.14"]
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

.github/workflows/run-notebook-demos-extra.yml

@@ -13,7 +13,7 @@ jobs:
     env:
       JUPYTER_PLATFORM_DIRS: 1
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.12
       uses: actions/setup-python@v6
       with:

.github/workflows/run-notebook-demos.yml

@@ -13,7 +13,7 @@ jobs:
     env:
       JUPYTER_PLATFORM_DIRS: 1
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.12
       uses: actions/setup-python@v6
       with:

.github/workflows/test-functions-python313.yml

@@ -11,7 +11,7 @@ jobs:
   test-optional-functions:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.13
       uses: actions/setup-python@v6
       with:

.github/workflows/test-functions.yml

@@ -11,7 +11,7 @@ jobs:
   test-functions:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.12
       uses: actions/setup-python@v6
       with:

.github/workflows/test-pip.yml

@@ -13,7 +13,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

.github/workflows/test_cpp_build.yml

@@ -9,7 +9,7 @@ jobs:
   test-cpp-build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.13
       uses: actions/setup-python@v6
       with:

.github/workflows/test_cpp_integration.yml

@@ -9,7 +9,7 @@ jobs:
   test-cpp-integration:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python 3.13
       uses: actions/setup-python@v6
       with: