Bump actions/upload-artifact from 3 to 4 (#30)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build_wheels.yml

@@ -31,7 +31,7 @@ jobs:
         run: pipx run build
 
       - name: Store artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           path: dist/*
 

.github/workflows/conda_package.yml

@@ -51,7 +51,7 @@ jobs:
         run: conda activate up
 
       - name: store windows result
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ matrix.os == 'windows-latest' }}
         with:
           path: win-64/*.tar.bz2
@@ -61,7 +61,7 @@ jobs:
         run: anaconda upload -l main -u ml4t win-64/*.tar.bz2
 
       - name: store linux result
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ matrix.os == 'ubuntu-latest' }}
         with:
           path: linux-64/*.tar.bz2
@@ -71,7 +71,7 @@ jobs:
         run: anaconda upload -l main -u ml4t linux-64/*.tar.bz2
 
       - name: store macos result
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ matrix.os == 'macos-latest' }}
         with:
           path: osx-64/*.tar.bz2