bump polkadot to v0.9.11

[0x8f701]

close: #675
close: #658
close: #750

To be finished

TODO:

• fix Liquid Staking's unit tests
• update runtime's pallet_balances' weights
• test producing blocks with parallelfinance/polkadot:v0.9.11
• test with frontend

[0x8f701]

blocked by:

• add TypeInfo trait bound for pallet-assets' attribute config paritytech/substrate#10031
• Update v0.9.11 open-web3-stack/open-runtime-module-library#622

[yz89]

Please don't merge until we tested the full liquid-staking pallet.

[0x8f701]

@ETeissonniere @drbh @ashi20192020ayush we decided to postpone the merge of this PR to be able to deliver web3 grant's milestone 2. So let's use xcm v1 for now, I'll migrate any of your xcm v1 code to v2 in this PR.

In general this PR is also ready but just lack of testing & fixing liquid staking's unit tests, I'll work on fixing it after delivering web3 grant milestone 2

[codecov-commenter]

Codecov Report

Merging #693 (13c810a) into master (e13ae1c) will decrease coverage by 0.63%.
The diff coverage is 55.31%.

❗ Current head 13c810a differs from pull request most recent head aaf03bd. Consider uploading reports for the commit aaf03bd to get more accurate results

@@            Coverage Diff             @@
##           master     #693      +/-   ##
==========================================
- Coverage   61.05%   60.42%   -0.64%     
==========================================
  Files          63       63              
  Lines        4727     4677      -50     
==========================================
- Hits         2886     2826      -60     
- Misses       1841     1851      +10     

Impacted Files	Coverage Δ
node/parallel/src/command.rs	0.00% <ø> (ø)
node/parallel/src/service.rs	0.00% <0.00%> (ø)
pallets/amm/src/mock.rs	80.00% <ø> (ø)
pallets/currency-adapter/src/lib.rs	45.94% <ø> (ø)
pallets/liquid-staking/src/mock.rs	59.13% <ø> (-8.61%)	⬇️
pallets/liquid-staking/src/tests.rs	100.00% <ø> (ø)
pallets/liquid-staking/src/types.rs	75.00% <ø> (ø)
pallets/liquidation/src/lib.rs	0.00% <0.00%> (ø)
pallets/loans/src/mock.rs	65.71% <ø> (ø)
pallets/loans/src/rate_model.rs	80.00% <ø> (ø)
... and 22 more

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