Bump pygments in /mpcontribs-serverless/dependencies (#1659)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Patrick Huck <phuck@lbl.gov>

mpcontribs-serverless/dependencies/requirements.txt

@@ -155,7 +155,7 @@ pybtex==0.24.0
     #   pymatgen
 pydantic==1.10.2
     # via emmet-core
-pygments==2.13.0
+pygments==2.15.0
     # via ipython
 pyisemail==2.0.1
     # via mpcontribs-client