build(deps): bump nbconvert in /Traffic-Sign-Detection

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 6.3.0 to 6.5.1.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Commits](jupyter/nbconvert@6.3.0...6.5.1)

---
updated-dependencies:
- dependency-name: nbconvert
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Traffic-Sign-Detection/requirements.txt

@@ -52,7 +52,7 @@ MarkupSafe==1.1.1
 matplotlib==3.3.3
 mistune==2.0.3
 nbclient==0.5.1
-nbconvert==6.3.0
+nbconvert==6.5.1
 nbformat==5.1.2
 nest-asyncio==1.4.3
 networkx==2.5