Bump pygments from 2.8.1 to 2.15.0

Bumps [pygments](https://github.com/pygments/pygments) from 2.8.1 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.8.1...2.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@ chardet==4.0.0
 colorama==0.4.4
 commonmark==0.9.1
 idna==2.10
-Pygments==2.8.1
+Pygments==2.15.0
 PyQt5>=5.14.2
 pytarallo>=2.3.0
 python-dotenv==0.17.0