chore(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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/pre-release-build.yml

@@ -32,22 +32,22 @@ jobs:
         with:
           format: YYYY_MMDD_HHmm
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: Chromium_Build_${{ steps.current-time.outputs.formattedTime }}
           path: build/chromium/*
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: Firefox_Build_${{ steps.current-time.outputs.formattedTime }}
           path: build/firefox/*
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: Chromium_Build_WithoutKatex_${{ steps.current-time.outputs.formattedTime }}
           path: build/chromium-without-katex-and-tiktoken/*
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: Firefox_Build_WithoutKatex_${{ steps.current-time.outputs.formattedTime }}
           path: build/firefox-without-katex-and-tiktoken/*