sync versions with current release (0.9.31) (#6176)

* Bump spec_version to 9310

* bump transaction_version (0.9.31) (#6171)

* Bump transaction_version for polkadot

* Bump transaction_version for kusama

* Bump transaction_version for rococo

* Bump transaction_version for westend

* Bump transaction_version for polkadot

* Bump transaction_version for kusama

* Bump transaction_version for rococo

* Bump transaction_version for westend

* Bump crate versions (0.9.31)