refactor: fix several warnings

[jansegre]

Motivation

Currently there are some warnings about behaviors that will be changed in Python 3.13+ and some usage patterns.

Acceptance Criteria

• fix asyncioreactor get_running_loop warning
• replace deprecated cgi module
• fix datetime.datetime.utcnow deprecation warning
• turn warnings into errors during tests

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

Branch	refactor/fix-several-warnings
Testbed	ubuntu-22.04

🚨 1 Alert

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Lower Boundary (Limit %)
sync-v2 (up to 20000 blocks)	Latency minutes (m)	📈 plot 🚷 threshold 🚨 alert (🔔)	1.39 m (-19.66%) Baseline: 1.73 m	1.55 m (112.03%)

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	1.39 m (-19.66%) Baseline: 1.73 m	1.55 m (112.03%)	2.07 m (66.95%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.24%. Comparing base (6b4b647) to head (ee84245).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1529      +/-   ##
==========================================
- Coverage   86.26%   86.24%   -0.03%     
==========================================
  Files         438      438              
  Lines       33764    33772       +8     
  Branches     5269     5269              
==========================================
  Hits        29127    29127              
- Misses       3622     3628       +6     
- Partials     1015     1017       +2     

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