docs: ignore blog.envoyproxy.io

[zirain]

xref: https://github.com/envoyproxy/gateway/actions/runs/23425732761/job/68140064144

Seems Medium change the policy for https://github.com/envoyproxy/gateway/actions/runs/23425732761/job/68140064144

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.33%. Comparing base (1005160) to head (ec67323).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8574      +/-   ##
==========================================
- Coverage   74.34%   74.33%   -0.02%     
==========================================
  Files         242      242              
  Lines       37707    37707              
==========================================
- Hits        28035    28030       -5     
- Misses       7730     7733       +3     
- Partials     1942     1944       +2     

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