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/benchmarks.yml

@@ -182,7 +182,7 @@ jobs:
 
       # Upload benchmark results as artifact
       - name: Upload Benchmark Results
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: benchmark-results
           path: |

.github/workflows/cross-compile.yml

@@ -32,13 +32,13 @@ jobs:
         run: cargo build --release
 
       - name: Upload freenet binary
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: binaries-x86_64-freenet
           path: target/release/freenet
 
       - name: Upload fdev binary
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: binaries-x86_64-fdev
           path: target/release/fdev
@@ -64,13 +64,13 @@ jobs:
         run: cargo build --release
 
       - name: Upload freenet binary
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: binaries-arm64-freenet
           path: target/release/freenet
 
       - name: Upload fdev binary
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: binaries-arm64-fdev
           path: target/release/fdev