Bump pygments from 2.13.0 to 2.15.0

Bumps [pygments](https://github.com/pygments/pygments) from 2.13.0 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.13.0...2.15.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-type: indirect
...

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

requirements.txt

@@ -119,7 +119,7 @@ pycparser==2.21
     # via cffi
 pycurl==7.45.1
     # via -r requirements.in
-pygments==2.13.0
+pygments==2.15.0
     # via
     #   ipython
     #   nbconvert