[27.x] vendor: google.golang.org/grpc v1.66.3

[thaJeztah]

• relates to vendor: google.golang.org/grpc v1.66.3 moby/moby#48898

---

• transport: Fix reporting of bytes read while reading headers
• xds/server: Fix xDS Server leak

full diff: grpc/grpc-go@v1.66.2...v1.66.3

- What I did

- How I did it

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.55%. Comparing base (cfe6090) to head (877668c).
Report is 3 commits behind head on 27.x.

Additional details and impacted files

@@           Coverage Diff           @@
##             27.x    #5631   +/-   ##
=======================================
  Coverage   58.55%   58.55%           
=======================================
  Files         346      346           
  Lines       29329    29329           
=======================================
  Hits        17173    17173           
  Misses      11178    11178           
  Partials      978      978           

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