Bump actions/upload-artifact from 3 to 4

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>

.github/workflows/build-test-riscv64.yml

@@ -65,7 +65,7 @@ jobs:
             '
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: packages
           path: ./dist

.github/workflows/build-wheels.yml

@@ -150,7 +150,7 @@ jobs:
         pipx run --spec='cibuildwheel==2.16.2' cibuildwheel --output-dir dist 2>&1
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: packages
         path: ./dist
@@ -193,7 +193,7 @@ jobs:
         python -m build --sdist --outdir dist .
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: packages
         path: ./dist

.github/workflows/doc-html-pdf.yml

@@ -42,7 +42,7 @@ jobs:
         pdfOptions: '{"margin": {"top": "1cm", "left": "1cm", "right": "1cm", "bottom": "1cm"}}'
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Proof-of-Space-Document
         path: ./documents/proof_of_space.pdf