tests: Fix resolver test endpoint

[Eric-Warehime]

Summary

resolver_test.go is failing because gmail's jabber SRV records seem not to exist anymore. I've updated the test to point to our own telemetry SRV records for devnet.

Test Plan

Unit test passes.

[codecov]

Codecov Report

Merging #4784 (6c1138b) into master (1a13168) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4784      +/-   ##
==========================================
- Coverage   54.71%   54.69%   -0.03%     
==========================================
  Files         414      414              
  Lines       53548    53548              
==========================================
- Hits        29299    29287      -12     
- Misses      21825    21834       +9     
- Partials     2424     2427       +3     

Impacted Files	Coverage Δ
ledger/tracker.go	74.04% <0.00%> (-4.69%)	⬇️
ledger/testing/randomAccounts.go	56.00% <0.00%> (-1.24%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
ledger/acctonline.go	78.12% <0.00%> (-0.53%)	⬇️
ledger/accountdb.go	72.55% <0.00%> (-0.08%)	⬇️
network/wsNetwork.go	65.80% <0.00%> (ø)
ledger/acctupdates.go	69.51% <0.00%> (+0.24%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️
network/netprio.go	78.26% <0.00%> (+8.69%)	⬆️

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[onetechnical]

I'm fine with this, but it does mean our tests are dependent on DevNet's DNS records. That's not the worst thing, but is a point of failure (and we do reserve the right to "reset" DevNet, during which time this will fail these checks.)