deps: bump pyopenssl from 25.3.0 to 26.0.0 in /api

[dependabot]

Bumps pyopenssl from 25.3.0 to 26.0.0.

Changelog

Sourced from pyopenssl's changelog.

26.0.0 (2026-03-15)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Dropped support for Python 3.7.
• The minimum cryptography version is now 46.0.0.

Deprecations: ^^^^^^^^^^^^^

Changes: ^^^^^^^^

• Added support for using aws-lc instead of OpenSSL.
• Properly raise an error if a DTLS cookie callback returned a cookie longer than DTLS1_COOKIE_LENGTH bytes. Previously this would result in a buffer-overflow. Credit to dark_haxor for reporting the issue. CVE-2026-27459
• Added OpenSSL.SSL.Connection.get_group_name to determine which group name was negotiated.
• Context.set_tlsext_servername_callback now handles exceptions raised in the callback by calling sys.excepthook and returning a fatal TLS alert. Previously, exceptions were silently swallowed and the handshake would proceed as if the callback had succeeded. Credit to Leury Castillo for reporting this issue. CVE-2026-27448

Commits

• 358cbf2 Prepare for 26.0.0 release (#1487)
• a8d28e7 Bump actions/cache from 4 to 5 (#1486)
• 6fefff0 Add aws-lc compatibility to tests and CI (#1476)
• a739f96 Bump actions/download-artifact from 8.0.0 to 8.0.1 (#1485)
• 8b4c66b Bump actions/upload-artifact in /.github/actions/upload-coverage (#1484)
• 02a5c78 Bump actions/upload-artifact from 6.0.0 to 7.0.0 (#1483)
• d973387 Bump actions/download-artifact from 7.0.0 to 8.0.0 (#1482)
• 57f09bb Fix buffer overflow in DTLS cookie generation callback (#1479)
• d41a814 Handle exceptions in set_tlsext_servername_callback callbacks (#1478)
• 7b29beb Fix not using a cryptography wheel on uv (#1475)
• Additional commits viewable in compare view

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Mar 16, 2026 4:52pm
flagsmith-frontend-preview	Ignored	Preview	Mar 16, 2026 4:52pm
flagsmith-frontend-staging	Ignored	Preview	Mar 16, 2026 4:52pm

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

Details

 10 tests across 7 suites
 11.1 seconds
 90fdd51
 🔄 Run: #15312 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

Details

 10 tests across 7 suites
 56.2 seconds
 90fdd51
 🔄 Run: #15312 (attempt 1)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.31%. Comparing base (89f2477) to head (90fdd51).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6964   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files        1335     1335           
  Lines       49760    49760           
=======================================
  Hits        48923    48923           
  Misses        837      837           

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