fix: healthcheck content-type

[luislhl]

Motivation

We are getting an error from aiohttp in explorer-service when trying to get /health from hathor-core and parse it as json.

Acceptance Criteria

• The /health endpoint should use the correct Content-Type which should be application/json, instead of text/html

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher

Report	Thu, August 22, 2024 at 19:30:56 UTC
Project	hathor-core
Branch	fix/healthcheck-content-type
Testbed	ubuntu-22.04

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Benchmark	Latency	Latency Results nanoseconds (ns) | (Δ%)	Latency Lower Boundary nanoseconds (ns) | (%)	Latency Upper Boundary nanoseconds (ns) | (%)
sync-v2 (up to 20000 blocks)	✅ (view plot)	104,042,467,308.64 (+1.27%)	92,461,354,314.26 (88.87%)	113,008,321,939.65 (92.07%)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.63%. Comparing base (f6ddf3c) to head (a0e3210).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1110      +/-   ##
==========================================
- Coverage   84.64%   84.63%   -0.02%     
==========================================
  Files         317      317              
  Lines       24149    24150       +1     
  Branches     3665     3665              
==========================================
- Hits        20441    20439       -2     
- Misses       3002     3005       +3     
  Partials      706      706              

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