Add Remotion endpoint fix reference

[cookesan]

Adds the upstream merge commit for remotion-dev/remotion#6378 to GHSA-2jqp-f4gr-44fr.

Evidence checked:

• PR Fix wrong data in GHSA-c32m-27pj-4xcj.json #6378 merged as commit e3fcb3382057bb0bf1b0128a4f40c557ece7527a.
• The v4.0.410 fixed tag contains that merge commit, and the release notes name Fix wrong data in GHSA-c32m-27pj-4xcj.json #6378 as the endpoint hardening change.
• The commit protects the file-explorer and add-asset endpoints by switching Windows file opening to spawn, requiring same-origin add-asset requests, and moving add-asset under the static hash route.
• The npm @remotion/studio-server 4.0.410 and @remotion/studio 4.0.410 packages contain the fixed endpoint code; @remotion/cli 4.0.410 depends on those packages and remotion 4.0.410.