build(deps): 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/Automerge.yml

@@ -99,7 +99,7 @@ jobs:
           EOF
 
       - name: '📤 Upload artifact: latest'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: latest
           path: install

.github/workflows/Tests.yml

@@ -44,7 +44,7 @@ jobs:
         run: stdbuf -i0 -o0 -e0 ./.github/scripts/${{ matrix.test }}.sh
 
       - name: '📤 Upload artifact: plots'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: f4pga-arch-defs-plots
@@ -82,13 +82,13 @@ jobs:
         run: stdbuf -i0 -o0 -e0 ./.github/scripts/install.sh '${{ matrix.fam }}'
 
       - name: '📤 Upload artifact: arch-defs packages'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: packages
           path: '*.tar.xz'
 
       - name: '📤 Upload artifact: plots'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: f4pga-arch-defs-plots