fix: ext auth example used a deprecated interface

[pkit]

What type of PR is this?

examples: fix deprecated interface

Release Notes: No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.42%. Comparing base (096cb8d) to head (0291822).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5771      +/-   ##
==========================================
+ Coverage   65.19%   65.42%   +0.22%     
==========================================
  Files         214      215       +1     
  Lines       34321    34608     +287     
==========================================
+ Hits        22377    22641     +264     
- Misses      10591    10592       +1     
- Partials     1353     1375      +22     

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[arkodg]

seeing a lint error

150:1 syntax error: found character '\t' that cannot start any token (syntax)

[pkit]

seeing a lint error

150:1 syntax error: found character '\t' that cannot start any token (syntax)

9 spaces and then tabs? Lol.
Fixed.

[zirain]

./examples/kubernetes/ext-auth-grpc-service.yaml
  Error: 150:9 syntax error: found character '\t' that cannot start any token (syntax)

examples/kubernetes/ext-auth-grpc-service.yaml
  Error: 150:9 syntax error: found character '\t' that cannot start any token (syntax)

[pkit]

Omg. It was the last space.
It's too much involvement for a one line fix. And all because yamllint has no auto-fix