Bump polkadot-api from 1.6.3 to 1.6.4

[dependabot[bot]]

Bumps polkadot-api from 1.6.3 to 1.6.4.

Release notes

Sourced from polkadot-api's releases.

polkadot-api@1.6.4

Fixed

• Edge-case problem with signed-extensions
• Fix issue with nonce values

Commits

• d3ac586 Fix race condition 1.6 (#824)
• 1383a66 polkadot-api@1.6.3 (#822)
• 27fef92 fix(chains): update lightSyncState and some bootnodes (#821)
• 326b0e3 chore: update deps
• 664ad6e fix: handle "exotic" extrinsics (#817)
• a038c0d fix(client): add missing unsafe api type export (#812)
• 77fda67 feat(lookup): expose inner type of compacts (#811)
• 5849523 polkadot-api@1.6.2 (#808)
• d4fa370 fix(observable-client): diferentiate static vs dynamic requests (#806)
• a1f1441 fix(cli): unable to run codegen on windows (#803)
• Additional commits viewable in compare view

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