Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yaml

@@ -144,7 +144,7 @@ jobs:
         run: cd extensions/vscode && npx vsce package --no-dependencies --target ${{ env.target }}
 
       # 6. Upload the .vsix as an artifact
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.target }}
           path: "extensions/vscode/*.vsix"

.github/workflows/preview.yaml

@@ -135,7 +135,7 @@ jobs:
         run: cd extensions/vscode && npx vsce package --pre-release --no-dependencies --target ${{ env.target }}
 
       # 6. Upload the .vsix as an artifact
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.target }}
           path: "extensions/vscode/*.vsix"