lib: drop invalid link on next-security-release md

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (a74c0aa) 83.00% compared to head (33c4262) 83.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #739 +/- ## ======================================= Coverage 83.00% 83.00% ======================================= Files 37 37 Lines 4184 4184 ======================================= Hits 3473 3473 Misses 711 711 ```

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