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] <[email protected]>

.github/workflows/typeset.yml

@@ -31,7 +31,7 @@ jobs:
         with:
           root_file: ledgersmb-book.tex
       - name: Upload PDF file
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: PDF
           path: ledgersmb-book.pdf
@@ -65,12 +65,12 @@ jobs:
       - name: Build site
         run: ./rebuild-site.sh
       - name: Upload split page book site
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: split-book
           path: public_html/split-book
       - name: Upload single page book site
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: full-book
           path: public_html/full-book