Bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  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/buildwheels.yml

@@ -80,7 +80,7 @@ jobs:
           CIBW_TEST_COMMAND: pytest -v -s -We -p no:unraisableexception {package}/tests
         run: python -m cibuildwheel --output-dir dist
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: dist-${{matrix.os}}
           path: dist
@@ -172,7 +172,7 @@ jobs:
     - name: Build source distribution
       run: pipx run build --sdist
 
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v7
       with:
         name: cibw-sdist
         path: dist/*.tar.gz
@@ -255,7 +255,7 @@ jobs:
       - uses: julia-actions/setup-julia@v3
       - run: mkdir readme_output
       - run: julia readme.jl > readme_output/julia_${{ matrix.os }}.txt
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: readme_output-julia_${{matrix.os}}
           path: readme_output
@@ -291,7 +291,7 @@ jobs:
 
       - run: mkdir readme_output
       - run: python -We readme.py > readme_output/python_${{ matrix.os }}.txt
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: readme_output-python_${{matrix.os}}
           path: readme_output
@@ -322,7 +322,7 @@ jobs:
           cd readme_fortran
           ./build/main > ../readme_output/fortran_${{matrix.os}}.txt
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: readme_output-fortran_${{matrix.os}}
           path: readme_output
@@ -422,7 +422,7 @@ jobs:
          else
            ./readme_cpp/build/my_test > readme_output/cpp_${{matrix.os}}.txt
          fi
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: readme_output-cpp_${{matrix.os}}
           path: readme_output
@@ -467,7 +467,7 @@ jobs:
           startup-options: -nojvm
           command: diary('readme_output/matlab.txt'), readme
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: readme_output-matlab
           path: readme_output