[ci] Bump pytest to 9.x (#16470)

* Bump pytest 8.4.2 => 9.0.2
* Bump pytest-rerunfailures 14.0 => 16.1

Authored by: bashonly, Grub4K

Co-authored-by: Simon Sawicki <contact@grub4k.dev>

.github/workflows/core.yml

@@ -2,6 +2,7 @@ name: Core Tests
 on:
   push:
     paths:
+      - pyproject.toml
       - .github/**
       - devscripts/**
       - test/**
@@ -13,6 +14,7 @@ on:
       - yt_dlp/extractor/extractors.py
   pull_request:
     paths:
+      - pyproject.toml
       - .github/**
       - devscripts/**
       - test/**