Bump pygments from 2.8.0 to 2.8.1

Bumps [pygments](https://github.com/pygments/pygments) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/2.8.1/CHANGES)
- [Commits](https://github.com/pygments/pygments/compare/2.8.0...2.8.1)

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

requirements.txt

@@ -5,7 +5,7 @@ flask==1.1.2
 idna==2.10
 jinja2==2.11.3
 lxml==4.6.3
-pygments==2.8.0
+pygments==2.8.1
 python-dateutil==2.8.1
 pyyaml==5.4.1
 httpx[http2]==0.17.1