Avoid garbage collection for requests.Session (#1189)

* workaround for garbage collection

* add missing import

* linting issues (wrong import order)

* fix imports

CHANGELOG.md

@@ -26,6 +26,7 @@ Add your changes below.
 - Fixed scripts in examples directory that didn't run correctly
 - Updated documentation for `Client.current_user_top_artists` to indicate maximum number of artists limit
 - Set auth cache file permissions to `600`: https://github.com/spotipy-dev/spotipy/security/advisories/GHSA-pwhh-q4h6-w599
+- Fixed `__del__` methods by preventing garbage collection for `requests.Session`
 
 ### Changed