upgrade to v1.2 (#56)

In the PR we bump versions for all dependacy crates from `polkadot-sdk`
and apply all required changes

Changes:
- `parachains_runtime_api_impl` `v5` -> `v7`,
  - from paritytech/polkadot-sdk#1543;
- `Consideration` setup for preimage pallet instances,
  - from  paritytech/polkadot-sdk#1363;
- `experimental` feature removed for `pallet-society`, `pallet-xcm`,
`runtime-common` crates,
  - from paritytech/polkadot-sdk#1503;
- `pallet_election_provider_multi_phase::Config::SignedDepositBase` set
to `GeometricDepositBase`,
  - from paritytech/polkadot-sdk#1547;
- support `open_outbound_hrmp_channel_for_benchmarks_or_tests` func
rename,
  - from paritytech/polkadot-sdk#1422;
- missing weight functions added for `runtime_parachains_hrmp` and
`pallet_preimage`;

TODO:
- [x] Deleted the Copy&paste para scheduler migration from
#26 in
b666613. This should be applied in the
next runtime upgrade, but i did not properly check yet.

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,19 @@ Changelog for the runtimes governed by the Polkadot Fellowship.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
+### Changed
+
+- Upgrade parachains runtime API from v5 to v7 in Polkadot and Kusama ([polkadot-fellows/runtimes#56](https://github.com/polkadot-fellows/runtimes/pull/56))
+- Upgrade Preimage pallet's config implementations to adapt the new `Consideration` API ([polkadot-fellows/runtimes#56](https://github.com/polkadot-fellows/runtimes/pull/56))
+- Remove `experimental` feature flag for `pallet-society`, `pallet-xcm`, and `runtime-common` crates imports ([polkadot-fellows/runtimes#56](https://github.com/polkadot-fellows/runtimes/pull/56))
+- Election provider: use a geometric deposit base calculation for EPM signed submissions in Polkadot and Kusama ([polkadot-fellows/runtimes#56](https://github.com/polkadot-fellows/runtimes/pull/56))
+
+### Fixed
+
+- Add missing weight functions for `runtime_parachains_hrmp` and `preimage` pallets ([polkadot-fellows/runtimes#56](https://github.com/polkadot-fellows/runtimes/pull/56))
+
 ## [1.0.1] 22.10.2023
 
 ### Changed