ci: fix the mypy/pylint workflow (#164)

Author: raboof

pelican/requirements.txt

@@ -4,7 +4,7 @@ pelican-sitemap==1.1.0
 soupsieve==2.0
 beautifulsoup4==4.9.3
 ezt==1.1
-PyYAML==5.4
+PyYAML==6.0.2
 certifi==2024.7.4
 idna==2.10
 charset-normalizer==2.0.4