Use faster runner instances

[AlekSi]

Description

Run integration tests on faster (paid) instances.

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Dec 22, 2022 at 10:48AM (UTC)

[codecov]

Codecov Report

Merging #1678 (b01c012) into main (57a03ba) will decrease coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1678      +/-   ##
==========================================
- Coverage   68.85%   68.83%   -0.03%     
==========================================
  Files         290      290              
  Lines       14110    14110              
==========================================
- Hits         9716     9713       -3     
- Misses       3445     3447       +2     
- Partials      949      950       +1     

Impacted Files	Coverage Δ
internal/util/version/version.go	70.58% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	84.86% <0.00%> (ø)

Flag	Coverage Δ
integration	64.69% <ø> (-0.03%)	⬇️
mongodb	14.37% <ø> (-0.01%)	⬇️
pg	53.95% <ø> (-0.03%)	⬇️
tigris	37.88% <ø> (-0.03%)	⬇️
unit	28.02% <ø> (-0.02%)	⬇️

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