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]>

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -122,7 +122,7 @@ jobs:
         PLATFORMIO_BUILD_FLAGS: ${{ matrix.gui.build_flags }}
 
     - name: Upload output to GitHub
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ matrix.env }}.bin
         path: .pio/build/${{ matrix.env }}/firmware.bin

.github/workflows/divert_sim.yaml

@@ -75,7 +75,7 @@ jobs:
           make -j
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: divert_sim
           path: OpenEVSE_WiFi/divert_sim/divert_sim
@@ -96,7 +96,7 @@ jobs:
           pytest -v --color=yes --code-highlight yes --junit-xml=output/test_results.xml
 
       - name : Upload test results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: test_results
           path: |