Migrate to RocksDB v7

[rubo]

Changes

• The RocksDB package has been updated to v7.7.3
• Removed rocksdb from brew install in README
• Removed RocksDB dependency workaround from Dockerfile
• Brought back GitHub Actions workflows runners to ubuntu-latest changed in Temporarily switch to ubuntu-20.04 image #4927 and Fix Nethermind/Ethereum tests with code coverage #5041

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests??

• Yes
• No

[codecov]

Codecov Report

Base: 66.91% // Head: 66.94% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (7335432) compared to base (c6dce52).
Patch coverage: 57.57% of modified lines in pull request are covered.

❗ Current head 7335432 differs from pull request most recent head dc268c7. Consider uploading reports for the commit dc268c7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5065      +/-   ##
==========================================
+ Coverage   66.91%   66.94%   +0.03%     
==========================================
  Files        1968     1969       +1     
  Lines       70564    70621      +57     
  Branches    13118    13126       +8     
==========================================
+ Hits        47215    47276      +61     
+ Misses      19382    19379       -3     
+ Partials     3967     3966       -1     

Impacted Files	Coverage Δ
...Nethermind.Blockchain/Synchronization/ISyncPeer.cs	50.00% <ø> (ø)
src/Nethermind/Nethermind.Db.Rocks/DbOnTheRocks.cs	64.66% <ø> (+0.63%)	⬆️
...2P/ProtocolHandlers/SyncPeerProtocolHandlerBase.cs	77.72% <ø> (ø)
...twork/P2P/Subprotocols/Snap/SnapProtocolHandler.cs	33.75% <0.00%> (+1.27%)	⬆️
.../Nethermind/Nethermind.Network/ProtocolsManager.cs	78.90% <0.00%> (ø)
...rmind.Synchronization/FastBlocks/BodiesSyncFeed.cs	10.57% <0.00%> (ø)
...nd.Network.Stats/Model/InitiateDisconnectReason.cs	36.84% <36.84%> (ø)
src/Nethermind/Nethermind.Network/PeerManager.cs	87.47% <40.00%> (-0.23%)	⬇️
...d/Nethermind.Synchronization/Peers/SyncPeerPool.cs	82.29% <62.50%> (ø)
....Synchronization/FastBlocks/FastHeadersSyncFeed.cs	53.31% <63.82%> (+1.99%)	⬆️
... and 25 more

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