docs: update docker registry link

[kamikazechaser]

Description

Update the docker registry link with the latest builds as per the Google cloudbuild config.

Other changes

None

Tested

N/A

Related issues

N/A

Backwards compatibility

N/A

[palango]

/gcbrun

[codecov]

Codecov Report

Base: 54.82% // Head: 54.83% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (dda25f4) compared to base (7cb677f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1986   +/-   ##
=======================================
  Coverage   54.82%   54.83%           
=======================================
  Files         695      695           
  Lines       93255    93255           
=======================================
+ Hits        51131    51138    +7     
- Misses      38270    38277    +7     
+ Partials     3854     3840   -14     

Impacted Files	Coverage Δ
consensus/istanbul/core/roundchange_v2.go	60.80% <0.00%> (-7.21%)	⬇️
p2p/discover/v4_udp.go	76.00% <0.00%> (-4.25%)	⬇️
accounts/keystore/watch.go	95.83% <0.00%> (-4.17%)	⬇️
p2p/simulations/mocker.go	36.89% <0.00%> (-3.89%)	⬇️
p2p/discover/table.go	80.46% <0.00%> (-2.34%)	⬇️
eth/protocols/snap/sync.go	71.80% <0.00%> (-0.77%)	⬇️
p2p/simulations/network.go	60.25% <0.00%> (-0.72%)	⬇️
trie/trie.go	76.89% <0.00%> (-0.69%)	⬇️
trie/proof.go	75.57% <0.00%> (-0.67%)	⬇️
consensus/istanbul/core/core.go	66.36% <0.00%> (-0.45%)	⬇️
... and 20 more

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[palango]

Thanks a lot.