Bump pygments from 2.7.4 to 2.15.0

Bumps [pygments](https://github.com/pygments/pygments) from 2.7.4 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.7.4...2.15.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -55,7 +55,7 @@ preshed==3.0.2
 prometheus-client==0.7.1
 prompt-toolkit==2.0.10
 ptyprocess==0.6.0
-Pygments==2.7.4
+Pygments==2.15.0
 pyparsing==2.4.5
 pyrsistent==0.15.5
 python-dateutil==2.8.1