CICD: reduce mmnet LastPartKeyRound to 50k

[algolucky]

Summary

• this changes the LastParKeyRound of the mmnet recipe to 50,000 instead of 3,000,000. this should speed up network bootstrapping.

[codecov]

Codecov Report

Merging #4625 (5bc6503) into master (fdef01f) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4625      +/-   ##
==========================================
+ Coverage   54.18%   54.20%   +0.01%     
==========================================
  Files         402      402              
  Lines       51828    51828              
==========================================
+ Hits        28084    28094      +10     
+ Misses      21379    21371       -8     
+ Partials     2365     2363       -2     

Impacted Files	Coverage Δ
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
data/transactions/verify/txn.go	46.19% <0.00%> (-0.96%)	⬇️
network/wsNetwork.go	64.57% <0.00%> (-0.20%)	⬇️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
ledger/tracker.go	74.89% <0.00%> (+0.85%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
network/wsPeer.go	67.64% <0.00%> (+2.13%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️

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[excalq]

Looks good.