[TASK] Bump to latest polkadot version

[1xstj]

We are currently on polkadot-stable2407, the latest polkadot release is stable- 2506
Looking at the release logs there are quite a bit of changes
https://github.com/paritytech/polkadot-sdk/releases

Checklist

• Upgrade to latest version supported by hyperbridge
• Upgrade tangle codebase
• Add migrations needed
• Release and upgrade nodes
• Upgrade testnet runtime
• Upgrade mainnet runtime