Fix dependabot airflow 91 87

[aagbsn]

Upgrade airflow to 2.11.1 to address these issues
https://github.com/ooni/data/security/dependabot/91
https://github.com/ooni/data/security/dependabot/87

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.04%. Comparing base (f8a3b80) to head (edcf93a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
+ Coverage   83.00%   83.04%   +0.03%     
==========================================
  Files          89       89              
  Lines        5726     5726              
==========================================
+ Hits         4753     4755       +2     
+ Misses        973      971       -2     

Flag	Coverage Δ
oonidata	77.87% <ø> (ø)
oonipipeline	85.68% <ø> (+0.05%)	⬆️

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