build(deps): bump pygments from 2.4.2 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.4.2 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.4.2...2.7.4)

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

frozen-requirements.txt

@@ -38,7 +38,7 @@ pkginfo==1.5.0.1
 pluggy==0.12.0
 port-for==0.3.1
 py==1.8.0
-Pygments==2.4.2
+Pygments==2.7.4
 pylint==2.3.1
 pypandoc==1.4
 pyparsing==2.4.0