fix(test): fix two occasional errors when running bridge tests

[davidtaikocha]

Error message:

  10 passing (15s)
  1 failing

  1) integration:Bridge
       processMessage()
         should throw if message has not been received:
     ProviderError: invalid argument 2: hex number > 64 bits
      at HttpProvider.request (node_modules/hardhat/src/internal/core/providers/http.ts:78:19)
      at LocalAccountsProvider.request (node_modules/hardhat/src/internal/core/providers/accounts.ts:188:34)
      at runMicrotasks (<anonymous>)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at async EthersProviderWrapper.send (node_modules/@nomiclabs/hardhat-ethers/src/internal/ethers-provider-wrapper.ts:13:20)

Its because the last parameter in the eth_getStorageAt call here should be a block number but not a block hash:

quantity | tag - Integer block number, or the string 'latest, 'earliest' or 'pending.

[codecov]

Codecov Report

Merging #305 (57d1e0c) into main (5c4d370) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
- Coverage   63.81%   63.65%   -0.17%     
==========================================
  Files          81       81              
  Lines        2388     2388              
  Branches      270      270              
==========================================
- Hits         1524     1520       -4     
- Misses        795      800       +5     
+ Partials       69       68       -1     

Flag	Coverage Δ		*Carryforward flag
protocol	59.77% <ø> (-0.30%)	⬇️
relayer	68.77% <ø> (ø)		Carriedforward from c528d67

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...es/protocol/contracts/thirdparty/LibMerkleTrie.sol	83.13% <0.00%> (-7.23%)	⬇️
...ges/protocol/contracts/libs/LibAnchorSignature.sol	100.00% <0.00%> (+10.52%)	⬆️

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