Bump nbconvert in /tensorflow_1_x/8_sentiment_network

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 5.1.1 to 6.5.1.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Commits](jupyter/nbconvert@5.1.1...6.5.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tensorflow_1_x/8_sentiment_network/requirements.txt

@@ -17,7 +17,7 @@ jupyter-console==5.1.0
 jupyter-core==4.3.0
 MarkupSafe==1.0
 mistune==0.8.1
-nbconvert==5.1.1
+nbconvert==6.5.1
 nbformat==4.3.0
 notebook==6.4.10
 numpy==1.22.0