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/build.yml

@@ -64,7 +64,7 @@ jobs:
 
       - name: Upload Reports
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: reports
           path: |

.github/workflows/conformance.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Upload Conformance Results
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: conformance-results
           path: conformance-test/results/

.github/workflows/samples.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Upload Reports
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: reports-${{ matrix.sample }}
           path: |