Bump actions/upload-artifact from 4 to 5 (#16)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -33,7 +33,7 @@ jobs:
           submodules: true
       - name: Download source
         run: curl -o ruby.tar.xz https://cache.ruby-lang.org/pub/ruby/snapshot/snapshot-master.tar.xz
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: snapshot-master
           path: ruby.tar.xz
@@ -119,7 +119,7 @@ jobs:
           echo "${{ steps.build.outcome == 'success' && '✅' || '❌' }} ${{ matrix.image.variant }}-$platform_safe" > outcome-${{ matrix.image.variant }}-$platform_safe.txt
 
       - name: Upload digest
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: digests-${{ matrix.image.variant }}-${{ env.platform_safe }}
           path: /tmp/digests/*
@@ -128,7 +128,7 @@ jobs:
 
       - name: Upload outcome
         if: success() || failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: outcome-${{ matrix.image.variant }}-${{ env.platform_safe }}
           path: outcome-${{ matrix.image.variant }}-${{ env.platform_safe }}.txt