Update swagger.yaml

[mircea-c]

Updated host name to with new URL

Closes: #XXX

Description

Updated swagger config. Changed the host name to the new hub node URL.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
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[fedekunze]

this is just the tag under which the endpoints are grouped

Suggested change

	- Gaia REST
	- Tendermint RPC

[codecov]

Codecov Report

Merging #5605 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5605      +/-   ##
==========================================
- Coverage   53.42%   53.41%   -0.02%     
==========================================
  Files         322      322              
  Lines       19745    19745              
==========================================
- Hits        10549    10547       -2     
- Misses       8379     8381       +2     
  Partials      817      817

Impacted Files	Coverage Δ
x/mock/app.go	65.24% <0%> (-1.22%)	⬇️