Bump pygments from 2.10.0 to 2.15.0

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
...

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

requirements.txt

@@ -45,7 +45,7 @@ pydantic==1.8.2; python_full_version >= "3.6.1"
 pyflakes==2.3.1; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 pygal==3.0.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 pygaljs==1.0.2; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
-pygments==2.10.0; python_version >= "3.6"
+pygments==2.15.0; python_version >= "3.6"
 pymdown-extensions==9.1; python_version >= "3.6"
 pyparsing==3.0.6; python_version >= "3.6"
 pytest-benchmark==3.4.1; (python_version >= "2.7" and python_full_version < "3.0.0") or (python_full_version >= "3.5.0")