Bump actions/upload-artifact from 5 to 6 (#1115)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/Benchmarks.yml

@@ -61,7 +61,7 @@ jobs:
       - name: Run Benchmarks
         run: just bench-ci main
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: benchmarks_${{runner.os}}_${{matrix.hypervisor}}_${{ matrix.cpu }}
           path: ./target/criterion/

.github/workflows/dep_build_guests.yml

@@ -78,7 +78,7 @@ jobs:
           just move-c-guests ${{ inputs.config }}
 
       - name: Upload Rust guests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rust-guests-${{ inputs.config }}
           path: |
@@ -87,7 +87,7 @@ jobs:
           if-no-files-found: error
 
       - name: Upload C guests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: c-guests-${{ inputs.config }}
           path: src/tests/c_guests/bin/${{ inputs.config }}/
@@ -96,7 +96,7 @@ jobs:
 
       - name: Upload interface.wasm
         if: inputs.config == 'debug'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: interface-wasm
           path: src/tests/rust_guests/witguest/interface.wasm
@@ -105,7 +105,7 @@ jobs:
 
       - name: Upload twoworlds.wasm
         if: inputs.config == 'debug'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: twoworlds-wasm
           path: src/tests/rust_guests/witguest/twoworlds.wasm

.github/workflows/dep_fuzzing.yml

@@ -52,7 +52,7 @@ jobs:
 
       - name: Upload Crash Artifacts
         if: failure() # This ensures artifacts are only uploaded on failure
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: fuzz-crash-artifacts
           path: fuzz/artifacts/