Release v1.4.0

[acatangiu]

All runtimes are targeted, major release as it upgrades Polkadot-SDK to stable2409-3.

• Update to SDK stable2409-1 #490
• Kusama Treasury: remove funding to the Kappa Sigma Mu Society and disable burn #507
• Lower Parachain and Data Deposits to Encourage Experimentation on Kusama #501
• Asset hubs - Add all assets in pool with native to XcmPaymentApi #523
• Bridges patch applied for stable2409 #519
• Fresh weights for stable2409 + fixes #522

[acatangiu]

Let's get this released in Jan 💪

[bkchr]

• CI: Add Ecosystem tests #521 would also be nice.

[pandres95]

• Add dynamic BurnParameters for Kusama Treasury #511 if I can get reviews in time.

[seadanda]

• Fix auto-renew benchmarks #517

[kianenigma]

• While Adds migrations to restore currupted staking ledgers in Polkadot and Kusama #447 fixed the core staking bug that we had last year, one account is still in an inconsistent state. To fix it, we either need a force_unstake(Root), or better, a one-off migration to fix it in this release. Juan and Michalis from W3F support are in touch with the account owner, and will provide a writeup to justify this migration. If writeup is ready in time, we should add this migration as well to fully close the book for this unfortunate bug.