CI: Bump actions/upload-artifact from 5 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/lagom-template.yml

@@ -167,7 +167,7 @@ jobs:
 
       - name: Upload LibWeb Test Artifacts
         if: ${{ always() && inputs.fuzzer == 'NO_FUZZ' }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: libweb-test-artifacts-${{ inputs.os_name }}
           path: ${{ github.workspace }}/Meta/Lagom/Build/Ladybird/test-dumps

.github/workflows/serenity-template.yml

@@ -210,7 +210,7 @@ jobs:
       #       all of the instrumented binaries and the profdata file.
       - name: Upload Coverage Results
         if: ${{ inputs.coverage == 'ON' && github.event_name != 'pull_request' }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: serenity-coverage
           path: ${{ steps.build-parameters.outputs.build_directory }}/reports

.github/workflows/wasm.yml

@@ -111,7 +111,7 @@ jobs:
           folder: ${{ github.workspace }}/libjs-data
 
       - name: Upload artifact package
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: serenity-js-wasm
           path: libjs-wasm.tar.gz