chore: Release v0.34.0

[MeltyBot]

Prepare MeltanoSDK v0.34.0 for release.

Checklist:

• Check that the right version is set in all the files.
• Groom the changelog for wording or missing entries.
• Merge this PR once everything looks good.

Release Draft

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📚 Documentation preview 📚: https://meltano-sdk--2087.org.readthedocs.build/en/2087/

[codspeed-hq]

CodSpeed Performance Report

Merging #2087 will not alter performance

_{Comparing release/v0.34.0 (f0bc684) with main (16bb509)}

Summary

✅ 4 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (16bb509) 87.63% compared to head (f0bc684) 87.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2087   +/-   ##
=======================================
  Coverage   87.63%   87.63%           
=======================================
  Files          60       60           
  Lines        4935     4935           
  Branches     1005     1005           
=======================================
  Hits         4325     4325           
  Misses        429      429           
  Partials      181      181           

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