pin Pygments to older version (#544)

Signed-off-by: olalekan odukoya <odukoyaonline@gmail.com>

Author: olamilekan000

docs/mkdocs.yml

@@ -124,7 +124,6 @@ markdown_extensions:
           class: mermaid
           format: !!python/name:pymdownx.superfences.fence_code_format
 
-
   - admonition
   # Enable content tabs
   - pymdownx.tabbed:

docs/requirements.txt

@@ -5,7 +5,8 @@ mkdocs-macros-plugin==1.0.5
 mkdocs-material[imaging]>=9.7.1
 mkdocs-material-extensions==1.3.1
 mkdocs-static-i18n==1.3.0
-pymdown-extensions==10.16.1
+pymdown-extensions==10.21.3
+Pygments<2.18
 
 # https://github.com/mkdocs/mkdocs/issues/4032
 click<=8.2.1