Announcing release v3.2.9 of Oppia!

[KEVIN THOMAS]

Hi Oppia Devs,

Happy new year! I'm glad to announce that we have successfully released v3.2.9 of Oppia.

Some of the major changes include:
- Improved validation for explorations.

- Improvements to the exploration migration pipeline.

- Fixes a major server error (#15942).

- Several bug fixes and improvements.

Please find the complete changelog here: https://github.com/oppia/oppia/blob/24c1dfffddac6bc01c05d52d328fb6c81e59bebf/CHANGELOG#L3-L281

Please welcome Abhishek, Aditya, Amit Panwar, Ayush Anand, Eshaan Aggarwal, Manish Roy, Nikhil, Priyansh Mehta, Subhash Thenua, Sakshi Jain, Shivkant Chauhan, Subin Duresh, Vaibhav Tripathi, Valeron, Yavik Kapadia, Zaid Ismail, Gustav Stappe Renner, and Jonathan D Lake for whom this release marks their first contribution to Oppia!

Thanks to Akshay Anand, Anshuman Maurya, Ashish Patwal, Ashutosh Chauhan, Eric Lou, Harshvardhan Singh, Hasitha Kaushan, Hitesh Tomar, Jeevesh, Jairo Honorio, Jay Vivarekar, Karen Honorio, Kevin Thomas, Manan Rathi, Matthew Sumpter, Nikhil, Pankaj Prajapati, Praneeth, Prayush Dawda, Qinghao Yang, Rijuta Singh, Sagang Wee, Sandeep Dubey, Sanjay Saju Jacob, Sean Lip, Shivam, Shivam Chaudhary, Shivam Jha, Soumyajyoti Dey, Chris, Vojtěch Jelínek, Akhil, Ramon, Mridul, Nithin, and Sahil Jhangar, our returning contributors who made this release possible.

Thanks,

Kevin (On behalf of the release team)