check.yml: fix cvt2utf not found sync with nuttx repository

This PR add missing cvt2utf installation on our CI
see apache/nuttx#16561

Signed-off-by: simbit18 <[email protected]>

Author: simbit18

.github/workflows/check.yml

@@ -46,7 +46,7 @@ jobs:
           echo "::add-matcher::nuttx/.github/nxstyle.json"
           python3 -m venv .venv
           source .venv/bin/activate
-          pip install cmake-format black isort flake8
+          pip install cmake-format black isort flake8 cvt2utf
           cd apps
           commits="${{ github.event.pull_request.base.sha }}..HEAD"
           git log --oneline $commits