ci: Upgrade upload-artifact action to v4

  `upload-artifact` v3 has been deprecated for a while now and Github
  Actions prevent its use now by automatically failing any job using it.

  Besides upgrading to the latest major version of the action, we add a
  compression level option that should better suit our needs (i.e. large
  files not easily compressed).
  See https://github.com/actions/upload-artifact/tree/v4.6.1?tab=readme-ov-file#usage

.github/workflows/linux.yaml

@@ -241,10 +241,11 @@ jobs:
           gh-token: "${{ secrets.GITHUB_TOKEN }}"
       - name: Save artifacts
         if: ${{ github.event_name == 'pull_request' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
             name: Binaries
             path: |
                 ${{ github.workspace }}/dist/latest-linux.yml
                 ${{ github.workspace }}/dist/Cozy[- ]Drive[- ]*.AppImage
             retention-days: 5
+            compression-level: 0

.github/workflows/macos.yaml

@@ -313,11 +313,12 @@ jobs:
           apple-team-id: "${{ secrets.apple_team_id }}"
       - name: Save artifacts
         if: ${{ github.event_name == 'pull_request' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
             name: Binaries
             path: |
                 ${{ github.workspace }}/dist/latest-mac.yml
                 ${{ github.workspace }}/dist/Cozy[- ]Drive[- ]*.dmg
                 ${{ github.workspace }}/dist/Cozy[- ]Drive[- ]*-mac.zip
             retention-days: 5
+            compression-level: 0