Fix eth_getBlockByNumber("latest") returning null intermittently & lack WS connections

[librelois]

What does it do?

Include 3 frontier fix:

• Fix eth_getBlockByNumber("latest") returning null intermittently polkadot-evm/frontier#1816
• fix: dropping lagging pubsub subscribers polkadot-evm/frontier#1814
• Fix inconsistent Eth block visibility caused by missing/stale block-n… polkadot-evm/frontier#1818

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✨ Finishing touches

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• Commit unit tests in branch elois/update-frontier-pin

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 2116 KB (no changes) ✅

Moonbeam runtime: 2232 KB (no changes) ✅

Moonriver runtime: 2232 KB (no changes) ✅

Compared to latest release (runtime-4201)

Moonbase runtime: 2116 KB (+184 KB compared to latest release) ⚠️

Moonbeam runtime: 2232 KB (+204 KB compared to latest release) ⚠️

Moonriver runtime: 2232 KB (+204 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                     Coverage Diff                      @@
##           master   elois/update-frontier-pin     +/-   ##
============================================================
  Coverage   77.08%                      77.08%   0.00%     
  Files         389                         389             
  Lines       76890                       76890             
============================================================
  Hits        59270                       59270             
  Misses      17620                       17620             

Files Changed	Coverage

Coverage generated Thu Feb 12 22:48:13 UTC 2026