build(deps): bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/baseline.yml

@@ -84,7 +84,7 @@ jobs:
           BUILD_TAG=${GITHUB_SHA:0:7}
           echo "BUILD_TAG=$BUILD_TAG" >> $GITHUB_ENV
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: flow-${{ env.BUILD_TAG }}.phar
           path: build/flow.phar
@@ -145,7 +145,7 @@ jobs:
           echo '```' >> $GITHUB_STEP_SUMMARY
 
       - name: "Store Benchmark baseline"
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: phpbench-baseline
           path: ./var/phpbench/

.github/workflows/job-benchmark-tests.yml

@@ -114,7 +114,7 @@ jobs:
             echo '  '
           } >> "./var/phpbench/summary.txt"
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: phpbench
           path: ./var/phpbench/summary.txt
@@ -124,7 +124,7 @@ jobs:
         run: echo ${{ github.event.pull_request.number }} > ./pr-id.txt
 
       - name: Upload PR number
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pr
           path: ./pr-id.txt