🧹 Update type comparison in ragged.py (#497)

* chore: Update type comparison in ragged.py

The code changes in ragged.py update the type comparison for the `tolerance` variable. Instead of using the `type()` function, it now uses the `isinstance()` function to check if `tolerance` is an instance of `pd.Timedelta`. This change improves the accuracy and reliability of the comparison.

Note: This commit message follows the established convention of using the "chore" type for non-functional changes that don't affect the code's behavior.

* update contributing docs

---------

Co-authored-by: Kevin Santana <kevinsantana11@gmail.com>

CONTRIBUTING.md

@@ -61,8 +61,9 @@ Common emojis to use are as follow:
 ❗ Deprecation of a feature
 ⛔ Removal of feature
 🐛 Bugfix
+🧹 Chore / refactoring / migration / dependency deprecation related
 ⚡ Performance/memory improvements
-🔍 Documentation, refactoring
+🔍 Documentation
 🔧 Tooling/Build scripts/CI (other non-application changes)
 ```