Bump pygments from 2.10.0 to 2.15.0 in /examples/streamlit (#437)

Bumps [pygments](https://github.com/pygments/pygments) from 2.10.0 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.10.0...2.15.0)

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

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examples/streamlit/requirements.txt

@@ -61,7 +61,7 @@ pyarrow==6.0.0
 pycodestyle==2.8.0
 pycparser==2.20
 pydeck==0.7.1
-Pygments==2.10.0
+Pygments==2.15.0
 pyparsing==2.4.7
 pyrsistent==0.18.0
 python-dateutil==2.8.2