Polkadot-staging update (#1305)
* Bump Substrate/Polkadot/Cumulus refs (#1295) Substrate: 31d90c202d6df9ce3837ee55587b604619a912ba Polkadot: 60df3c55c711c2872872d6220f98b2611340e051 Cumulus: a9630551c2cd877952ab769c862af4c81b0ccd3c * bump chain spec versions (#1297) * Fix ss58 prefixes of Polkadot, Kusama and Westend used by relay (#1298) * fix ss58 prefixes of Polkadot, Kusama and Westend * fmt * Use raw balance value if tokenDecimals property is missing (#1299) * use raw balance value if tokenDecimals property is missing * fmt * Revert nightly docker pin (#1301) * Revert "pin bridges-ci image (#1256)" This reverts commit 4009d970. * Revert "remporary use pinned bridges-ci image in Dockerfile (#1258)" This reverts commit 4f988406. * fix session length of Rococo and Wococo (#1304)