[release/v1.3] pin envoy and ratelimit

[guydc]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Release Notes: Yes/No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.46%. Comparing base (1e9f2a3) to head (db17f2d).
Report is 2 commits behind head on release/v1.3.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v1.3    #5968      +/-   ##
================================================
+ Coverage         67.99%   68.46%   +0.46%     
================================================
  Files               211      211              
  Lines             33170    33151      -19     
================================================
+ Hits              22555    22696     +141     
+ Misses             9258     9091     -167     
- Partials           1357     1364       +7     

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