Update default minimum TLS version to 1.3

[Fedosin]

Fixes #

Proposed Changes

This updates the eventingtls package to use TLS 1.3 as the default minimum version, aligning with the default behavior of knative.dev/pkg/network/tls. The fallback to TLS 1.2 and the associated TODO have been removed.

Additionally, tests asserting the default MinVersion have been removed from pkg/eventingtls and cmd/requestreply, as this configuration is now handled entirely by the underlying knative.dev/pkg/network/tls utility.
🧹

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.02%. Comparing base (cb8edb9) to head (7da07cc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8916      +/-   ##
==========================================
- Coverage   51.02%   51.02%   -0.01%     
==========================================
  Files         409      409              
  Lines       22001    21999       -2     
==========================================
- Hits        11226    11224       -2     
  Misses       9911     9911              
  Partials      864      864              

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[knative-prow]

@Fedosin: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
conformance-tests_eventing_main	7da07cc	link	true	/test conformance-tests
upgrade-tests_eventing_main	7da07cc	link	true	/test upgrade-tests
reconciler-tests_eventing_main	7da07cc	link	true	/test reconciler-tests

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