Relax requirements for textproc/py-pygments

--- requirements.txt.orig	2022-03-27 12:26:34 UTC
+++ requirements.txt
@@ -23,5 +23,5 @@ mkdocs-material-extensions>=1.0.3
 markdown>=3.2
 mkdocs>=1.3.0
 mkdocs-material-extensions>=1.0.3
-pygments>=2.10
+pygments
 pymdown-extensions>=9.0