build(deps): bump pygments from 2.7.2 to 2.7.4 in /chromium

Bumps [pygments](https://github.com/pygments/pygments) from 2.7.2 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.7.2...2.7.4)

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

Author: dependabot[bot]

chromium/requirements.txt

@@ -67,7 +67,7 @@ pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycparser==2.20
 pycrypto==2.6.1
-Pygments==2.7.2
+Pygments==2.7.4
 PyNaCl==1.4.0
 python-dateutil==2.8.1
 python-gnupg==0.4.6