fix: Allow name-lookup example to resolve on multiple chains

[FrederikBolding]

Allow name-lookup example Snap to resolve on Sepolia and the 1337 local chain used for E2E. This eases testing with it.

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Note

Low Risk
Manifest-only change that expands the allowed endowment:name-lookup chain IDs for an example Snap; low risk aside from potentially affecting which networks the snap can resolve names on.

Overview
Updates the name-lookup example Snap manifest to allow endowment:name-lookup resolution on additional chains by expanding chains from mainnet-only to include local E2E (eip155:1337) and Sepolia (eip155:11155111).

Also updates the snap source.shasum to match the new bundled output.

^{Reviewed by Cursor Bugbot for commit 129a18b. Bugbot is set up for automated code reviews on this repo. Configure here.}

[FrederikBolding]

@metamaskbot update-pr

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (c78b534) to head (129a18b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3953   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         427      427           
  Lines       12344    12344           
  Branches     1939     1939           
=======================================
  Hits        12167    12167           
  Misses        177      177           

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