chore: prepare v20 branch for release

[HashEngineering]

Issue being fixed or feature implemented

• support building on Mac
• adjust protocol and set v20 block height

What was done?

How Has This Been Tested?

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[codecov]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (6b91b05) 48.01% compared to head (50ea365) 48.01%.
Report is 1 commits behind head on feature-core-20.

Files	Patch %	Lines
...c/main/java/org/bitcoin/paymentchannel/Protos.java	8.33%	11 Missing ⚠️
core/src/main/java/org/bitcoinj/wallet/Protos.java	70.27%	11 Missing ⚠️
...a/org/bitcoinj/protocols/channels/ClientState.java	0.00%	7 Missing ⚠️
.../main/java/org/bitcoin/crawler/PeerSeedProtos.java	0.00%	5 Missing ⚠️
...a/org/bitcoinj/protocols/channels/ServerState.java	0.00%	5 Missing ⚠️
...in/java/org/bitcoin/protocols/payments/Protos.java	87.50%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##             feature-core-20     #238   +/-   ##
==================================================
  Coverage              48.01%   48.01%           
  Complexity              6665     6665           
==================================================
  Files                    409      409           
  Lines                  46109    46110    +1     
  Branches                6502     6502           
==================================================
+ Hits                   22137    22141    +4     
+ Misses                 21565    21562    -3     
  Partials                2407     2407           

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[Syn-McJ]

Looks good