cmd: add third charon relay

[aly-obol]

Add a third relay "https://2.relay.obol.dev" to the --p2p-relays flag default values.

category: feature ticket: none

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.77%. Comparing base (4c5f76f) to head (f2b1188).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3227      +/-   ##
==========================================
+ Coverage   57.62%   57.77%   +0.15%     
==========================================
  Files         211      211              
  Lines       30370    30370              
==========================================
+ Hits        17501    17547      +46     
+ Misses      10981    10939      -42     
+ Partials     1888     1884       -4     

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