perf: use virtual threads

[olavloite]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (78e01fa) 90.54% compared to head (e505c18) 90.47%.
Report is 18 commits behind head on postgresql-dialect.

❗ Current head e505c18 differs from pull request most recent head b2e8dfa. Consider uploading reports for the commit b2e8dfa to get more accurate results

Files	Patch %	Lines
...om/google/cloud/spanner/pgadapter/ProxyServer.java	88.88%	2 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##             postgresql-dialect    #1267      +/-   ##
========================================================
- Coverage                 90.54%   90.47%   -0.08%     
- Complexity                 2603     2619      +16     
========================================================
  Files                       141      141              
  Lines                      8896     8962      +66     
  Branches                   1291     1303      +12     
========================================================
+ Hits                       8055     8108      +53     
- Misses                      564      574      +10     
- Partials                    277      280       +3     

Flag	Coverage Δ
all_tests	90.47% <92.85%> (-0.08%)	⬇️

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