chore(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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -85,14 +85,14 @@ jobs:
           ./scripts/build-dtest-jars.sh
 
       - name: Upload dtest jars artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: dtest-jars
           path: dtest-jars/
           retention-days: 90
 
       - name: Upload cassandra tarballs artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: cassandra-tarballs
           path: cassandra-tarballs/
@@ -141,7 +141,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: unit-test-results-java-${{ matrix.java }}
           path: |
@@ -151,7 +151,7 @@ jobs:
 
       - name: Upload static analysis reports
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: static-analysis-reports-java-${{ matrix.java }}
           path: |
@@ -242,7 +242,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: integration-lightweight-results-java-${{ matrix.java }}-cassandra-${{ matrix.cassandra }}
           path: |
@@ -340,7 +340,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: integration-heavyweight-results-java-${{ matrix.java }}-cassandra-${{ matrix.cassandra }}
           path: |