fix(xo-server): dispose stream properly after v2v import

[fbeauchamp]

Description

Short explanation of this PR (feel free to re-use commit message)

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft

[b-Nollet]

We should probably notify the bugfix in the changelog

[julien-f]

No CHANGELOG entries?

[fbeauchamp]

No CHANGELOG entries?
this is not visible by the user. I think there was a forum message pointing to unclosed resource, but I don't find it.
Do you think a changelog entry is needed here ?

[julien-f]

@fbeauchamp I was thinking about packages to release :)