Update mkdocs, mkdocs-material and PyYAML. (#98)

Fixes Cython3 Pyyaml issues #90

Author: leMaik

requirements.txt

@@ -7,11 +7,11 @@ livereload==2.6.3
 lunr==0.5.8
 Markdown==3.3.7
 MarkupSafe==2.1.3
-mkdocs==1.5.3
+mkdocs==1.6.1
 mkdocs-macros-plugin==1.0.4
-mkdocs-material==9.5.13
+mkdocs-material==9.5.35
 nltk==3.6.2
-PyYAML==5.3.1
+PyYAML==6.0
 regex==2022.4.24
 six==1.16.0
 tornado==6.1