Revert Merkle proof verifier contract

[doubledup]

Fixes: SNO-427

Following the release of paritytech/substrate#14176, this upgrades our relaychain to 0.9.43 which includes that revert. This also brings back our previous Merkle proof verifier, which doesn't use hash sorting.

[codecov]

Codecov Report

Patch coverage: 33.33% and no project coverage change.

Comparison is base (3db3ed5) 67.26% compared to head (dda33a5) 67.26%.

Additional details and impacted files

@@                   Coverage Diff                   @@
##           vincent/outbound-queue     #861   +/-   ##
=======================================================
  Coverage                   67.26%   67.26%           
=======================================================
  Files                          13       13           
  Lines                         223      223           
  Branches                       51       51           
=======================================================
  Hits                          150      150           
  Misses                         53       53           
  Partials                       20       20           

Impacted Files	Coverage Δ
core/packages/contracts/src/ParachainClient.sol	56.66% <0.00%> (ø)
core/packages/contracts/src/BeefyClient.sol	64.00% <50.00%> (ø)

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