Bump notebook from 6.1.5 to 6.4.1 in /actions/hls_helloworld_python/sw (#138)

Bumps [notebook](http://jupyter.org) from 6.1.5 to 6.4.1.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

actions/hls_helloworld_python/sw/requirements.txt

@@ -26,7 +26,7 @@ MarkupSafe==1.1.1
 mistune==0.8.4
 nbconvert==5.6.1
 nbformat==5.0.6
-notebook==6.1.5
+notebook==6.4.1
 packaging==20.3
 pandocfilters==1.4.2
 parso==0.7.0