Bump envoy version and use shared go version

[ReToCode]

Changes

• As per Upgrade to distroless envoy #1271 (comment)
• Bumps envoy versions
• Uses shared go setup action to have aligned versions

Release Note

`net-kourier` now uses envoy in version 1.31

/assign @skonto let's see if we can go with 1.31 as default or not.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.31%. Comparing base (b558ed4) to head (67d0da3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1288   +/-   ##
=======================================
  Coverage   62.31%   62.31%           
=======================================
  Files          24       24           
  Lines        1632     1632           
=======================================
  Hits         1017     1017           
  Misses        553      553           
  Partials       62       62           

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[skonto]

/lgtm
/approve

[knative-prow]

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