Replace superseded protobuf package

[grzpiotrowski]

• Replaced the deprecated protobuf package

The superseded package is still indirectly referenced by istio.io/api

Resolves #226

[codecov]

Codecov Report

Merging #231 (f1f3f02) into main (0adfe0c) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
- Coverage   64.01%   63.86%   -0.16%     
==========================================
  Files          33       33              
  Lines        3224     3224              
==========================================
- Hits         2064     2059       -5     
- Misses        990      993       +3     
- Partials      170      172       +2     

Flag	Coverage Δ
integration	69.85% <ø> (-0.33%)	⬇️
unit	58.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	∅ <ø> (∅)
pkg/common (u)	76.99% <ø> (ø)
pkg/istio (u)	29.69% <ø> (ø)
pkg/log (u)	31.81% <ø> (ø)
pkg/reconcilers (u)	33.68% <ø> (ø)
pkg/rlptools (u)	57.63% <ø> (ø)
controllers (i)	69.85% <ø> (-0.33%)	⬇️

Files Changed	Coverage Δ
pkg/rlptools/wasm_utils.go	62.81% <ø> (ø)

... and 3 files with indirect coverage changes