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/ci.yml

@@ -187,7 +187,7 @@ jobs:
             cd ..; \
           done;
       - name: Preserve built Apache for perl-test job
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: apache-trunk
           path: /usr/local/apache2
@@ -228,7 +228,7 @@ jobs:
           curl --fail --max-time 10 http://localhost:8090
           curl --fail --max-time 10 http://localhost:8090/mod_cluster_manager
       - name: Preserve logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: Windows logs for ${{ matrix.os }}
@@ -266,7 +266,7 @@ jobs:
           cd test
           sh testsuite.sh
       - name: Preserve test logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: Test logs
@@ -309,7 +309,7 @@ jobs:
           grep "Result: PASS" -q t/logs/test-perl.log
           exit $?
       - name: Preserve test logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: Perl tests logs
@@ -329,7 +329,7 @@ jobs:
       - name: Build doxygen docs
         run: doxygen
       - name: Preserve doxygen docs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Doxygen docs
           path: doxygen-out/html/*