add Go 1.26 to CI flow

[aldas]

https://go.dev/doc/go1.16

• update security.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.93%. Comparing base (48f25a6) to head (817d037).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2899   +/-   ##
=======================================
  Coverage   92.92%   92.93%           
=======================================
  Files          43       43           
  Lines        4480     4486    +6     
=======================================
+ Hits         4163     4169    +6     
  Misses        197      197           
  Partials      120      120           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.